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Lassen E, Pacey A, Skytte AB, Montgomerie R. Recent decline in sperm motility among donor candidates at a sperm bank in Denmark. Hum Reprod 2024; 39:1618-1627. [PMID: 38834185 PMCID: PMC11291611 DOI: 10.1093/humrep/deae115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 05/07/2024] [Indexed: 06/06/2024] Open
Abstract
STUDY QUESTION Has there been variation in semen quality among men applying to be sperm donors (i.e. donor candidates) in Denmark in recent years (2017-2022)? SUMMARY ANSWER The motile sperm concentration and total motile sperm count (TMSC) in ejaculates-both measures of sperm quality-declined by as much as 22% from 2019 to 2022. WHAT IS KNOWN ALREADY Questions remain about whether human semen quality has declined in recent years. Whilst some studies provide evidence for a decline in human semen quality, these findings have been disputed owing to potential biases in the populations studied or in the methods used to measure semen quality. Resolution of this issue has important implications for human fertility, as well as for those involved in the recruitment of sperm donors for use in medically assisted reproduction. STUDY DESIGN, SIZE, DURATION We obtained data on the semen quality of ejaculates previously collected from 2017 to 2022 at sperm bank locations in four cities in Denmark: Aarhus, Aalborg, Copenhagen, and Odense. Our study focuses on the single semen samples provided by 6758 donor candidates aged between 18 and 45 years old to determine whether their sperm quality met a minimum criterion for them to be accepted as sperm donors. PARTICIPANTS/MATERIALS, SETTING, METHODS All ejaculates were analyzed within 1 hour of production. Semen volume (ml) was estimated by weight and both the concentration (106/ml) of sperm as well as the concentration of motile sperm (World Health Organization grades a and b) were measured using the same protocols and computer-assisted semen analysis system across all years at each site. Statistical analyses of the semen variables were controlled for age and donation site, as well as the average monthly high temperature when the ejaculate was produced. MAIN RESULTS AND THE ROLE OF CHANCE From 2017 to 2019, semen volume, sperm concentration, and total sperm count in the ejaculates of donor candidates increased by 2-12%. Then, from 2019 to 2022, sperm concentration and total sperm count changed by 0.1-5% from year to year, but none of those changes were statistically significant. In contrast, both motile sperm concentration and TMSC declined significantly, by 16% and 22%, respectively, between 2019 and 2022. Thus, the concentration of motile sperm in donor candidates declined from 18.4 [95% CL: 17.0, 20.0] million/ml in 2019 to 15.5 [14.4, 16.7] million/ml in 2022, and TMSC declined from 61.4 [55.8, 67.5] million per ejaculate in 2019 to 48.1 [44.1, 52.4] million in 2022. LIMITATIONS, REASONS FOR CAUTION We cannot determine from the available data the causes of the decline in semen quality of donor candidates from 2019 to 2022. However, as this period coincides with lockdowns and changes in work patterns during the coronavirus disease 2019 pandemic, it is possible that changes in motile sperm concentration and TMSC were the result of changes in the lifestyles of the men whose semen was analyzed. WIDER IMPLICATIONS OF THE FINDINGS Men providing initial semen samples at sperm banks, when applying to be sperm donors, are a useful population in which to monitor changes in human semen quality over time. Our results have implications for human fertility and the recruitment of sperm donors for medically assisted reproduction, where motile sperm concentration is an essential selection criterion because it influences fertility. We suggest that gathering health and lifestyle data on donor candidates at sperm banks might help to identify causal factors for the decline of sperm quality that could be addressed and intervention, if desired, could be personalized for each accepted donor. STUDY FUNDING/COMPETING INTEREST(S) No external funding was obtained for this study. E.L. and A.-B.S. are employees of Cryos International. AP reports paid consultancy for Cryos International, Cytoswim Ltd, Exceed Health, and Merck Serono in the last 2 years of this study, but all monies were paid to the University of Sheffield (former employer). AP is also an unpaid trustee of the Progress Educational Trust (Charity Number 1139856). RM declares support from Cryos International to present results of this research at ESHRE 2023. None of the authors were directly involved in the collection or physical analysis of semen samples. TRIAL REGISTRATION NUMBER N/A.
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Affiliation(s)
- Emilie Lassen
- Cryos International Sperm and Egg Bank, Aarhus, Denmark
| | - Allan Pacey
- School of Medical Sciences, Faculty of Biology, Medicine and Health, Core Technology Facility, University of Manchester, Manchester, UK
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Tang S, Lu J, Xu Y, Wang J, Hong R, Ge Y, Liang Y. Analysis of selected sperm samples by a computer-assisted system with high frame rate: A prospective study. Health Sci Rep 2023; 6:e1217. [PMID: 37123552 PMCID: PMC10140643 DOI: 10.1002/hsr2.1217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 03/27/2023] [Accepted: 04/04/2023] [Indexed: 05/02/2023] Open
Abstract
Background and Aims Due to the rapid motility of the selected sperm, sperm parameters cannot be accurately determined by the manual method. So, the application of a computer-assisted sperm analysis system with a high frame rate (HFR-CASA, 85 Hz) in sperm selection is investigated. Methods A total of 177 semen samples were collected for sperm selection with density gradient centrifugation. Then, the manual method and HFR-CASA method will be used to observe and analyze the sperm concentration, motility, and percentage of progressively motile sperm (PR) of the selected sperm samples. The quality control of sperm concentration was performed with microballoons. Two selected sperm samples were analyzed 10 times repeatedly to evaluate the accuracy of the HFR-CASA. Results The results of microballoons analyzed with the HFR-CASA were in control. The coefficients of variation of sperm concentration, motility, and PR from two selected sperm samples were all below 10%. The results of 177 selected sperm samples analyzed by the manual method and HFR-CASA showed that although there were significant positive correlations in sperm concentration, motility, and PR between them (p < 0.001), the manual method significantly underestimated sperm concentration (p = 0.002) but overestimated sperm motility and PR (p < 0.001). When sperm concentration was below 50 × 106/mL, the manual method significantly overestimated sperm concentration (p < 0.05). However, when sperm concentration was more than 100 × 106/mL, the manual method significantly underestimated sperm concentration (p < 0.001). Regardless of sperm concentration, the manual method consistently overestimated sperm motility and PR (p < 0.001). When sperm concentration was more than 20 × 106/mL, there was no correlation in sperm PR between them (p > 0.05). When sperm concentration was below 50 × 106/mL, the correct rate of captured sperm by the HFR-CASA was more than 98%. Conclusion The HFR-CASA method is more accurate than the manual method in analyzing the selected sperm samples.
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Affiliation(s)
- Shan‐Shan Tang
- Center for Reproductive Medicine, Zhongda HospitalSoutheast UniversityNanjingJiangsuChina
| | - Jin‐Chun Lu
- Center for Reproductive Medicine, Zhongda HospitalSoutheast UniversityNanjingJiangsuChina
| | - Yuan‐Hua Xu
- Center for Reproductive Medicine, Zhongda HospitalSoutheast UniversityNanjingJiangsuChina
| | - Jing Wang
- Center for Reproductive Medicine, Zhongda HospitalSoutheast UniversityNanjingJiangsuChina
| | - Ren‐Yun Hong
- Center for Reproductive Medicine, Zhongda HospitalSoutheast UniversityNanjingJiangsuChina
| | - Yan‐Mei Ge
- Center for Reproductive Medicine, Zhongda HospitalSoutheast UniversityNanjingJiangsuChina
| | - Yuan‐Jiao Liang
- Center for Reproductive Medicine, Zhongda HospitalSoutheast UniversityNanjingJiangsuChina
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Jiang LY, Kong FF, Yao L, Zhang FX, Wang SS, Jin XY, Tong XM, Zhang SY. Are testicular sperms superior to ejaculated sperms in couples with previous ART failure due to high rate of fragmented embryos? A retrospective cohort study. Front Surg 2023; 9:1065751. [PMID: 36684174 PMCID: PMC9852334 DOI: 10.3389/fsurg.2022.1065751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2022] [Accepted: 11/09/2022] [Indexed: 01/08/2023] Open
Abstract
Objective The aim was to clarify whether using testicular sperm reduces embryo fragmentation and improves cycle outcomes. Methods Fragmented embryo was defined as an embryo in which fragments account for more than one third of the embryonic surface area. High rate of fragmented embryos was defined by a proportion of fragmented embryos higher than 50%. We recruited infertile couples who had undergone at least one ovarian stimulation cycle using ejaculated sperm but failed to conceive due to high rate of fragmented embryos in each previous cycle. After fully informed consent, the couples agreed to obtain testicular sperm by testicular puncture and use testicular sperm for intracytoplasmic sperm injection (ICSI). The normal fertilization rate, transferable embryo rate, fragmented embryo rate and cycle outcomes were compared between ejaculated sperm group (EJA-sperm group) and testicular sperm group (TESTI-sperm group). Results Twenty-two couples who agreed to participate in our study underwent 32 ICSI cycles with ejaculated spermatozoa and 23 ICSI cycles with testicular spermatozoa. Embryo transfers were cancelled in 8 ejaculated cycles and 4 testicular cycles because of no transferable embryos. There were no significant differences in age, normal fertilization rate and high-quality embryo rate between ejaculated and testicular groups. The transferable embryo rate and implantation rate in TESTI-sperm group were significantly higher than those in EJA-sperm group (36.9% vs. 22.0%, p < 0.01; 34.2% vs. 0%, p < 0.001). The fragmented embryo rate in TESTI-sperm group was significantly lower than that in EJA-sperm group (61.2% vs. 75.7%, p < 0.05). Conclusion Our small retrospective cohort study suggests that using testicular sperm may be a recommended option for couples with previous ART failure because of high rate of fragmented embryos. Large samples, multicenter studies or randomized controlled trial (RCT) are needed to further confirm the superiority of testicular sperm.
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Affiliation(s)
- Ling-Ying Jiang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China,Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, China
| | - Fei-Fei Kong
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Lv Yao
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Fu-Xing Zhang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Sha-Sha Wang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiao-Ying Jin
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Xiao-Mei Tong
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China,Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, China,Correspondence: Song-Ying Zhang Xiao-Mei Tong
| | - Song-Ying Zhang
- Assisted Reproduction Unit, Department of Obstetrics and Gynecology, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, Hangzhou, China,Key Laboratory of Reproductive Dysfunction Management of Zhejiang Province, Hangzhou, China,Correspondence: Song-Ying Zhang Xiao-Mei Tong
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Garcia-Grau E, Lleberia J, Costa L, Guitart M, Yeste M, Benet J, Amengual MJ, Ribas-Maynou J. Decline of Sperm Quality over the Last Two Decades in the South of Europe: A Retrospective Study in Infertile Patients. BIOLOGY 2022; 12:biology12010070. [PMID: 36671762 PMCID: PMC9856056 DOI: 10.3390/biology12010070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 12/26/2022] [Accepted: 12/28/2022] [Indexed: 01/04/2023]
Abstract
Semen quality has a direct relation to male fertility. Whether sperm variables in humans have decreased over the last years is still uncertain, with some studies showing a decline and others reporting no changes. In this regard, previous research has suggested that lifestyle and environmental conditions may contribute to this variability, calling for regional studies. The present work is a retrospective, unicentric study that includes semen samples analyzed between 1997 and 2017 at the Parc Taulí Hospital (Barcelona metropolitan area). First, a multivariate analysis including the age as a confounding factor showed a statistically significant decrease in semen volume, pH, progressive motility, morphology and total motile sperm over time. Contrarily, no significant variation in sperm count or concentration was observed. Mean reductions per year were -0.02 mL for volume, -0.57% for progressively motile sperm and -0.72% for sperm with normal morphology. Interestingly, the average annual temperature registered by the Spanish Meteorology Agency negatively correlated to sperm morphology and sperm count (Rs = -0.642; p = 0.002 and Rs = -0.435; p = 0.049, respectively). In conclusion, the present study based on infertile patients from the Barcelona area found a decline in sperm motility and morphology, without effects on sperm count. Changes in temperature appeared to be associated to this decline, but further studies are needed to address the mechanisms linked to the observed variations.
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Affiliation(s)
- Emma Garcia-Grau
- Departament of Obstetrics and Gynecology, Parc Taulí Health Corporation, ES-08208 Sabadell, Spain
- Unit of Obstetrics and Gynecology, Department of Pediatrics, Obstetrics and Gynecology, and Preventive Medicine and Public Health, Faculty of Medicine, Autonomous University of Barcelona, Bellaterra, (Cerdanyola del Vallès), ES-08193 Barcelona, Spain
| | - Judith Lleberia
- Departament of Obstetrics and Gynecology, Parc Taulí Health Corporation, ES-08208 Sabadell, Spain
| | - Laura Costa
- Departament of Obstetrics and Gynecology, Parc Taulí Health Corporation, ES-08208 Sabadell, Spain
| | - Miriam Guitart
- UDIAT Diagnostic Center, Parc Taulí Health Corporation, ES-08208 Sabadell, Spain
| | - Marc Yeste
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Institute of Food and Agricultural Technology, University of Girona, ES-17003 Girona, Spain
- Unit of Cell Biology, Department of Biology, Faculty of Sciences, University of Girona, ES-17003 Girona, Spain
- Catalan Institution for Research and Advanced Studies (ICREA), ES-08010 Barcelona, Spain
- Correspondence:
| | - Jordi Benet
- Unit of Cell Biology and Medical Genetics, Department of Cell Biology, Physiology and Immunology, Faculty of Medicine, Autonomous University of Barcelona, Bellaterra (Cerdanyola del Vallès), ES-08193 Barcelona, Spain
| | - María José Amengual
- UDIAT Diagnostic Center, Parc Taulí Health Corporation, ES-08208 Sabadell, Spain
| | - Jordi Ribas-Maynou
- Biotechnology of Animal and Human Reproduction (TechnoSperm), Institute of Food and Agricultural Technology, University of Girona, ES-17003 Girona, Spain
- Unit of Cell Biology, Department of Biology, Faculty of Sciences, University of Girona, ES-17003 Girona, Spain
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Finelli R, Leisegang K, Tumallapalli S, Henkel R, Agarwal A. The validity and reliability of computer-aided semen analyzers in performing semen analysis: a systematic review. Transl Androl Urol 2021; 10:3069-3079. [PMID: 34430409 PMCID: PMC8350227 DOI: 10.21037/tau-21-276] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Accepted: 05/27/2021] [Indexed: 12/05/2022] Open
Abstract
Background Computer-aided sperm analyzers (CASA) are currently used worldwide for semen analysis. However, there are doubts about their reliability to fully substitute the human operator. Therefore, this study aimed to systematically review the current literature comparing results from semen evaluation by both CASA-based and manual approaches. Methods A systematic screening of the literature was performed based on the PRISMA guidelines and by searching on PubMed, Scopus, and Embase databases. Results A total of 14 studies were included. Our results showed a high degree of correlation for sperm concentration and motility when analysis was performed either manually or by using a CASA system. However, CASA results showed increased variability in low (<15 million/mL) and high (>60 million/mL) concentration specimens, while sperm motility assessment was inaccurate in samples with higher concentration or in the presence of non-sperm cells and debris. Morphology results showed the highest level of difference, due to the high amount of heterogeneity seen between the shapes of the spermatozoa either in one sample or across multiple samples from the same subject. Conclusions Overall, our study suggests CASA systems as a valid alternative for the evaluation of semen parameters in clinical practice, especially for sperm concentration and motility. However, further technological improvements are required before these devices can one day completely replace the human operator. Artificial intelligence-based CASA devices promise to offer higher efficiency of the analysis and improve the reliability of results.
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Affiliation(s)
- Renata Finelli
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, OH, USA
| | - Kristian Leisegang
- School of Natural Medicine, Faculty of Community and Health Sciences, University of the Western Cape, Bellville, South Africa
| | | | - Ralf Henkel
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, OH, USA.,Department of Metabolism, Digestion and Reproduction, Imperial College London, London, UK.,Department of Medical Bioscience, University of the Western Cape, Bellville, South Africa.,LogixX Pharma, Theale, Berkshire, UK
| | - Ashok Agarwal
- American Center for Reproductive Medicine, Cleveland Clinic, Cleveland, OH, USA
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Dai C, Zhang Z, Jahangiri S, Shan G, Moskovstev S, Librach C, Jarvi K, Sun Y. Automated motility and morphology measurement of live spermatozoa. Andrology 2021; 9:1205-1213. [PMID: 33740840 DOI: 10.1111/andr.13002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 03/05/2021] [Accepted: 03/16/2021] [Indexed: 12/17/2022]
Abstract
BACKGROUND Automated sperm analysis has wide applications in infertility diagnosis. Existing systems are not able to measure sperm count and both motility and morphology of individual live spermatozoa. Morphology measurement requires invasive staining, making the spermatozoa after morphology measurement not applicable to infertility treatment. OBJECTIVE To evaluate the reproducibility and reliability of automated measurement of individual live sperm's motility and morphology. MATERIALS AND METHODS Fresh semen samples were obtained from twenty male partners attending for fertility investigations. The system firstly measured motility for all the spermatozoa within the field of view under a low magnification (20×), then a spermatozoa of interest is selected by the user and automatically relocated by the system after switching to a high magnification (100×) for morphology measurement. Reproducibility of sperm measurements was evaluated by intraclass correlation coefficients on consecutive measurement. Reliability of motility and morphology measurement was evaluated by tracking error rate and limits of agreement, respectively, with manual measurement as benchmark. RESULTS Measurement of all motility and morphology parameters had intraclass correlation coefficients higher than 0.94. Sperm motility measurement had a tracking error rate of 2.1%. Limit of agreement analysis indicated that automated measurement and manual measurement of sperm morphology were interchangeable. Automated measurement of all morphology parameters was not statistically different from manual measurement, as confirmed by the paired sample t test. DISCUSSION Automated motility and morphology measurement of single sperm revealed high reproducibility and reliability. The system also achieved a high efficiency for motility and morphology measurement. In addition to the intracytoplasmic sperm injection (ICSI) samples with polyvinylpyrrolidone (PVP), the developed sperm measurement technique is also effective for analyzing semen and washed samples. The system provides a valuable tool for quantitative measurement and selection of single spermatozoa for ICSI. It can also be used for sperm motility and morphology analysis in andrology laboratories.
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Affiliation(s)
- Changsheng Dai
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada
| | - Zhuoran Zhang
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada
| | | | - Guanqiao Shan
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada
| | | | | | - Keith Jarvi
- Division of Urology, Mount Sinai Hospital, Toronto, ON, Canada
| | - Yu Sun
- Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, ON, Canada.,Institute of Biomaterials & Biomedical Engineering, University of Toronto, Toronto, ON, Canada.,Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON, Canada.,Department of Computer Science, University of Toronto, Toronto, ON, Canada
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Onofre J, Geenen L, Cox A, Van Der Auwera I, Willendrup F, Andersen E, Campo R, Dhont N, Ombelet W. Simplified sperm testing devices: a possible tool to overcome lack of accessibility and inconsistency in male factor infertility diagnosis. An opportunity for low- and middle- income countries. Facts Views Vis Obgyn 2021; 13:79-93. [PMID: 33889864 PMCID: PMC8051200 DOI: 10.52054/fvvo.13.1.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
Background Manual semen assessment (MSA) is a key component in a male’s fertility assessment. Clinicians rely on it to make diagnostic and treatment decisions. When performed manually, this routine laboratory test is prone to variability due to human intervention which can lead to misdiagnosis and consequently over- or under- treatment. For standardisation, continuous training, quality control (QC) programs and pricy Computer-Assisted Sperm Analysis (CASA) systems have been proposed, yet, without resolving intra- and inter-laboratory variability. In response, promising simplified sperm testing devices, able to provide cost-effective point-of-care male infertility diagnosis are prospected as a plausible solution to resolve variability and increase access to sperm testing. Materials and methods A throughout literature research for semen testing, sperm analysis, smart-phone assisted semen analysis, ‘at-home’ semen testing, male infertility, infertility in developing countries, infertility in low- and middle-income countries (LMIC) and quantitative sperm analysis was performed. A total of 14 articles, specific to ‘at-home’ simplified sperm assessment, were included to treat the core subject. Results Continuous training and consistent QC, are sine qua none conditions to achieve accurate and comparable MSA. Compliance does not rule-out variability, nevertheless. Emerging simplified sperm assessment devices are an actual alternative to resolve the lack of standardisation and accessibility to sperm analysis. YO ® , SEEM ® , and ExSeed ® are commercially available, user-friendly smartphone-based devices which can accurately measure volume, sperm concentration (millions/ml) and total motile sperm count. More broadly, by cost-effectiveness, availability, accuracy and convenient application, these devices could effectively select patients for first-line artificial reproduction treatments such as intrauterine insemination. Conclusions Accuracy and cost-effectiveness make smart-phone based sperm testing devices a practical and realistic solution to overcome variability in MSA. Importantly, these tools represent an actual opportunity to standardise and improve male subfertility diagnosis and treatment, especially in LMIC. However, before clinical application is possible, guidelines, further testing with special attention on accuracy in washed sperm, availability, cost-benefit and reliability are required.
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Affiliation(s)
- J Onofre
- Genk Institute for Fertility Technology, Genk, Belgium.,Department of Obstetrics, Gynaecology and Infertility, Ziekenhuis Oost Limburg, Genk, Belgium
| | - L Geenen
- University of Hasselt, Faculty of Medicine and Life Sciences, Diepenbeek, Belgium
| | - A Cox
- Department of Obstetrics, Gynaecology and Infertility, Ziekenhuis Oost Limburg, Genk, Belgium
| | - I Van Der Auwera
- Department of Obstetrics, Gynaecology and Infertility, Ziekenhuis Oost Limburg, Genk, Belgium
| | | | | | - R Campo
- Genk Institute for Fertility Technology, Genk, Belgium.,Department of Obstetrics, Gynaecology and Infertility, Ziekenhuis Oost Limburg, Genk, Belgium
| | - N Dhont
- Genk Institute for Fertility Technology, Genk, Belgium.,Department of Obstetrics, Gynaecology and Infertility, Ziekenhuis Oost Limburg, Genk, Belgium
| | - W Ombelet
- Genk Institute for Fertility Technology, Genk, Belgium.,Department of Obstetrics, Gynaecology and Infertility, Ziekenhuis Oost Limburg, Genk, Belgium
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Lammers J, Chtourou S, Reignier A, Loubersac S, Barrière P, Fréour T. Comparison of two automated sperm analyzers using 2 different detection methods versus manual semen assessment. J Gynecol Obstet Hum Reprod 2021; 50:102084. [PMID: 33545411 DOI: 10.1016/j.jogoh.2021.102084] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2020] [Revised: 01/15/2021] [Accepted: 01/28/2021] [Indexed: 12/21/2022]
Abstract
PURPOSE The exploration of male infertility is mainly based on semen analysis, but its evaluation might be affected by the operator's competence and subjectivity. This led to the development of automated semen analyzing systems. Despite continuous improvement, the precision and correlation of these automated systems with manual sperm assessment performed strictly according to WHO guidelines remains variable in the literature, and their role in daily practice is debated. METHODS In this double blind prospective study, we compared the results provided by 2 automated systems based on different concepts (CASA and electro-optical signal) with manual sperm assessment. Sperm concentration, motility and morphology were performed simultaneously and independently by different operators, blinded to each other. RESULTS A total of 102 unselected men attending the andrology department for routine sperm analysis were included in the study. We found no significant difference between each automated method and manual assessment for all sperm parameters, except for sperm morphology assessment where the electro-optical system gave higher results and performed slightly poorer than CASA. Correlation was moderate to high between manual assessment and each automated methods for all sperm parameters, with randomly distributed differences. CONCLUSIONS Overall, these results show that both types of automated systems can be implemented in andrology laboratory for routine sperm analysis.
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Affiliation(s)
- Jenna Lammers
- CHU Nantes, Nantes Université, Service de biologie et médecine de la reproduction, Nantes, France; Nantes Université, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Sana Chtourou
- CHU Nantes, Nantes Université, Service de biologie et médecine de la reproduction, Nantes, France; Laboratoire de biologie de la reproduction et de cytogénétique, Hôpital Aziza Othmana, Tunis, Tunisia
| | - Arnaud Reignier
- CHU Nantes, Nantes Université, Service de biologie et médecine de la reproduction, Nantes, France; Nantes Université, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Sophie Loubersac
- CHU Nantes, Nantes Université, Service de biologie et médecine de la reproduction, Nantes, France; Nantes Université, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Paul Barrière
- CHU Nantes, Nantes Université, Service de biologie et médecine de la reproduction, Nantes, France; Nantes Université, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France
| | - Thomas Fréour
- CHU Nantes, Nantes Université, Service de biologie et médecine de la reproduction, Nantes, France; Nantes Université, Inserm, Centre de Recherche en Transplantation et Immunologie, UMR 1064, ITUN, Nantes, France.
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9
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Dardmeh F, Heidari M, Alipour H. Comparison of commercially available chamber slides for computer-aided analysis of human sperm. Syst Biol Reprod Med 2020; 67:168-175. [PMID: 33375858 DOI: 10.1080/19396368.2020.1850907] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Despite the increasing use of computer-aided sperm analysis (CASA) in clinical practice, there is still no golden standard for the type of slide to be used with these systems. Counting chamber depth and loading method, can profoundly influence motility and concentration estimates, thereby undermining the validity and accuracy of CASA. To contribute toward standardized sperm analysis, this study compared different commercially available capillary-filled slides including 10 and 20 µm deep Leja slides (Leja10 and Leja20); 10, 16 and 20 µm deep CellVision slides (CV10, CV16 and CV20); and drop-loaded slides including slide and coverslip (SCS) with a depth of 20.1 µm and the Makler chamber with a depth of 10 µm for sperm analysis when using CASA. The Sperm Class Analyzer (SCA) CASA system was used to assess concentration, motility, and detailed kinematic parameters of 20 normozoospermic human samples using the different chamber slides. Results were evaluated by the repeated measures ANOVA and Intraclass correlation coefficients. The Makler chamber showed significantly (P < 0.05) higher concentrations than other slides. However, there was no significant difference in the percentage of sperm in different motility groups among the slides. CV10, Leja10 and Makler showed significantly higher curvilinear-, average path- and straight-line velocity (VCL, VAP, VSL) values than other slides. In conclusion, despite the objectiveness of the assessments by CASA systems, there are still some discrepancies in the results of sperm concentration, motility and other kinematic parameters when using different commercially available slides. The possible negative influence of the sperm quality misdiagnosis on the selection of treatment strategy in a clinical setting, emphasizes the need for further standardization and quality control of the commercially available chamber slides for use with CASA. Furthermore, this study found more consistent results for capillary-filled chambers compared to drop-loaded slides, suggesting a superior method when using CASA.Abbreviations: DNA: Deoxyribonucleic acid; CASA: Computer-aided semen analysis; SCA: Sperm Class Analyzer; WHO: World Health Organization; CV: CellVision; SCS: Slide and Coverslip; SD: Standard deviation; ANOVA: Analysis of Variance; PR: Progressive; NP: Non-progressive; IMT: Immotile; VCL: Curvilinear velocity; VAP: Average path velocity; VSL: Straight-line velocity; Lin: Linearity; STR: Straightness; WOB: Wobble; ALH: Amplitude of lateral head displacement; BCF: Beat cross frequency.
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Affiliation(s)
- Fereshteh Dardmeh
- Laboratory of Regenerative Medicine, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
| | - Mahmoud Heidari
- Department of Biology, Islamic Azad University, Gorgan Branch, Gorgan, Iran
| | - Hiva Alipour
- Laboratory of Regenerative Medicine, Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
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10
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Douglas C, Parekh N, Kahn LG, Henkel R, Agarwal A. A Novel Approach to Improving the Reliability of Manual Semen Analysis: A Paradigm Shift in the Workup of Infertile Men. World J Mens Health 2019; 39:172-185. [PMID: 31749341 PMCID: PMC7994658 DOI: 10.5534/wjmh.190088] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 10/08/2019] [Accepted: 10/28/2019] [Indexed: 12/13/2022] Open
Abstract
Conventional semen analysis (SA) is an essential component of the male infertility workup, but requires laboratories to rigorously train and monitor technicians as well as regularly perform quality assurance assessments. Without such measures there is room for error and, consequently, unreliable results. Furthermore, clinicians often rely heavily on SA results when making diagnostic and treatment decisions, however conventional SA is only a surrogate marker of male fecundity and does not guarantee fertility. Considering these challenges, the last several decades have seen the development of many advances in SA methodology, including tests for sperm DNA fragmentation, acrosome reaction, and capacitation. While these new diagnostic tests have improved the scope of information available to clinicians, they are expensive, time-consuming, and require specialized training. The latest advance in laboratory diagnostics is the measurement of seminal oxidation-reduction potential (ORP). The measurement of ORP in an easy, reproducible manner using a new tool called the Male Infertility Oxidative Stress System (MiOXSYS) has demonstrated ORP's potential as a feasible adjunct test to conventional SA. Additionally, the measurement of ORP by this device has been shown to be predictive of both poor semen quality and male infertility. Assessing ORP is a novel approach to both validating manual SA results and identifying patients who may benefit from treatment of male oxidative stress infertility.
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Affiliation(s)
- Christopher Douglas
- American Center for Reproductive Medicine, Cleveland Clinic, OH, USA.,Texas College of Osteopathic Medicine, Fort Worth, TX, USA
| | - Neel Parekh
- American Center for Reproductive Medicine, Cleveland Clinic, OH, USA.,Department of Urology, Cleveland Clinic, Cleveland, OH, USA
| | - Linda G Kahn
- American Center for Reproductive Medicine, Cleveland Clinic, OH, USA.,Department of Pediatrics, New York University School of Medicine, New York City, NY, USA
| | - Ralf Henkel
- American Center for Reproductive Medicine, Cleveland Clinic, OH, USA.,Department of Medical Bioscience, University of the Western Cape, Bellville, South Africa
| | - Ashok Agarwal
- American Center for Reproductive Medicine, Cleveland Clinic, OH, USA.
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11
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Machine Learning-Based Analysis of Sperm Videos and Participant Data for Male Fertility Prediction. Sci Rep 2019; 9:16770. [PMID: 31727961 PMCID: PMC6856178 DOI: 10.1038/s41598-019-53217-y] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 10/24/2019] [Indexed: 01/12/2023] Open
Abstract
Methods for automatic analysis of clinical data are usually targeted towards a specific modality and do not make use of all relevant data available. In the field of male human reproduction, clinical and biological data are not used to its fullest potential. Manual evaluation of a semen sample using a microscope is time-consuming and requires extensive training. Furthermore, the validity of manual semen analysis has been questioned due to limited reproducibility, and often high inter-personnel variation. The existing computer-aided sperm analyzer systems are not recommended for routine clinical use due to methodological challenges caused by the consistency of the semen sample. Thus, there is a need for an improved methodology. We use modern and classical machine learning techniques together with a dataset consisting of 85 videos of human semen samples and related participant data to automatically predict sperm motility. Used techniques include simple linear regression and more sophisticated methods using convolutional neural networks. Our results indicate that sperm motility prediction based on deep learning using sperm motility videos is rapid to perform and consistent. Adding participant data did not improve the algorithms performance. In conclusion, machine learning-based automatic analysis may become a valuable tool in male infertility investigation and research.
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12
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Agarwal A, Henkel R, Huang C, Lee M. Automation of human semen analysis using a novel artificial intelligence optical microscopic technology. Andrologia 2019; 51:e13440. [DOI: 10.1111/and.13440] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 08/09/2019] [Accepted: 08/30/2019] [Indexed: 12/30/2022] Open
Affiliation(s)
- Ashok Agarwal
- American Center for Reproductive Medicine Cleveland Clinic Cleveland OH USA
| | - Ralf Henkel
- American Center for Reproductive Medicine Cleveland Clinic Cleveland OH USA
- Department of Medical Bioscience University of the Western Cape Bellville South Africa
| | | | - Maw‐Sheng Lee
- Lee Women's Hospital Taichung Taiwan
- Institute of Medicine Chung Shan Medical University Taichung Taiwan
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13
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Schubert B, Badiou M, Force A. Computer‐aided sperm analysis, the new key player in routine sperm assessment. Andrologia 2019; 51:e13417. [DOI: 10.1111/and.13417] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2018] [Revised: 05/17/2019] [Accepted: 06/03/2019] [Indexed: 01/18/2023] Open
Affiliation(s)
- Benoit Schubert
- Eurofins Biomnis – Institut Rhonalpin IVF Center Clinique du Val d'Ouest – Medicentre Ecully France
| | - Mélanie Badiou
- Eurofins Biomnis – Institut Rhonalpin IVF Center Clinique du Val d'Ouest – Medicentre Ecully France
| | - André Force
- Eurofins Biomnis – Institut Rhonalpin IVF Center Clinique du Val d'Ouest – Medicentre Ecully France
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14
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Song WH, Ryu DY, Pang WK, Yoon SJ, Rahman MS, Pang MG. NT5C1B and FH are closely associated with cryoprotectant tolerance in spermatozoa. Andrology 2019; 8:221-230. [PMID: 31168966 DOI: 10.1111/andr.12653] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 04/15/2019] [Accepted: 04/29/2019] [Indexed: 12/11/2022]
Abstract
BACKGROUND Cryoprotective agent (CPA) addition during sperm cryopreservation causes detrimental effects on sperm function and quality. We previously reported that CPA addition adversely affects bull sperm physiological functions and shows differentially expressed proteins. OBJECTIVES To study functional and proteomic alterations between high CPA-tolerant spermatozoa (HCS) and low CPA-tolerant spermatozoa (LCS) in bull. MATERIALS AND METHODS Bull semen was collected from the cauda epididymides of Korean bull (Hanwoo) and suspended in Tris-egg yolk buffer (TYB). The collected fresh semen was diluted down to a final concentration of 6% glycerol TYB solution. After CPA exposure to the sperm cells from individual bulls, the percentage of sperm motility was examined by utilizing a computer-assisted sperm analysis system. According to sperm motility value, the HCS (motility above 80%) and LCS (motility below 60%) groups were evaluated for sperm function parameters (swimming speed, capacitation, viability, and mitochondrial function) and protein expression. RESULTS The HCS group had good sperm function parameters following CPA addition, whereas sperm functions in the LCS group were significantly reduced. There were differentially expressed proteins between the HCS and LCS groups. Cytosolic 5-nucleotidase 1B and fumarate hydratase were abundantly expressed in the HCS group, while F-actin-capping protein subunit beta, voltage-dependent anion-selective channel protein 2, and cytochrome b-c1 complex subunit 1 had a lower expression in the HCS group than in the LCS group. DISCUSSION AND CONCLUSION Identified proteins implicate potential markers to predict CPA-tolerable spermatozoa, which could provide a method of selecting animals and breeds with cryoprotectant resistance.
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Affiliation(s)
- Won-Hee Song
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Korea.,BET Research Institute, Chung-Ang University, Anseong, Korea
| | - Do-Yeal Ryu
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Korea.,BET Research Institute, Chung-Ang University, Anseong, Korea
| | - Won-Ki Pang
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Korea.,BET Research Institute, Chung-Ang University, Anseong, Korea
| | - Sung-Jae Yoon
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Korea.,BET Research Institute, Chung-Ang University, Anseong, Korea
| | - Md Saidur Rahman
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Korea.,BET Research Institute, Chung-Ang University, Anseong, Korea
| | - Myung-Geol Pang
- Department of Animal Science and Technology, Chung-Ang University, Anseong, Korea.,BET Research Institute, Chung-Ang University, Anseong, Korea
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15
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Dearing C, Jayasena C, Lindsay K. Can the Sperm Class Analyser (SCA) CASA-Mot system for human sperm motility analysis reduce imprecision and operator subjectivity and improve semen analysis? HUM FERTIL 2019; 24:208-218. [DOI: 10.1080/14647273.2019.1610581] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Chey Dearing
- School of Health & Sport Science and School of Nursing, Eastern Institute of Technology, Taradale Campus, Hawkes Bay, New Zealand
| | - Channa Jayasena
- Andrology Laboratory, Hammersmith Hospital, Imperial College NHS Trust, London, UK
| | - Kevin Lindsay
- Andrology Laboratory, Hammersmith Hospital, Imperial College NHS Trust, London, UK
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16
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Wu Y, Yang X, Wang H, Wang T. Evaluation of the Sysmex UF-1000i system as an alternative for the screening of genital tract inflammation in male infertility patients. Andrologia 2018; 50:e13054. [PMID: 29806204 DOI: 10.1111/and.13054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Revised: 04/21/2018] [Accepted: 04/24/2018] [Indexed: 11/29/2022] Open
Abstract
The number of white blood cell (WBC) in semen is an important indicator of genital tract inflammation in male infertility. The peroxidase assay is the recommended reference method for seminal WBC counting. However, it is time-consuming and may cause relatively heavy workload in daily routine. Meanwhile, the main component in the reagent of peroxidase test is harmful to human and the environment. In this study, we evaluated the analytical performance of the Sysmex UF-1000i that is a urine flow cytometer as a screening tool for genital tract infection in male infertility patients through the counting of seminal WBC. We examined 143 semen samples and compared the results of UF-1000i and manual microscopy. The intra-assay variability, stability and linearity studies were performed. The intravariability (CV %) of seminal WBC count by Sysmex UF-1000i was 2.34%-9.65%. The method of UF-1000i displayed a good agreement with the reference assay of manual microscopy, and the r value for correlation of seminal WBC count between UF-1000i and manual microscopy was over 0.999 (p < 0.001). The Sysmex UF-1000i is capable of producing reliable seminal WBC count consistent with that obtained by manual microscopy. It is a suitable alternative to the manual microscopy, thus reduces the workload.
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Affiliation(s)
- Yonghua Wu
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Xu Yang
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
| | - Haining Wang
- Department of Endocrinology, Peking University Third Hospital, Beijing, China
| | - Tiancheng Wang
- Department of Laboratory Medicine, Peking University Third Hospital, Beijing, China
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17
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Effects of Chronic Musculoskeletal Pain on Fertility Potential in Lean and Overweight Male Patients. Pain Res Manag 2018; 2017:4628627. [PMID: 29375246 PMCID: PMC5757111 DOI: 10.1155/2017/4628627] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2017] [Revised: 11/03/2017] [Accepted: 11/13/2017] [Indexed: 11/30/2022]
Abstract
Both chronic pain and obesity are known to affect reproductive hormone profiles in male patients. However, the effect of these conditions, alone or in combination, on male fertility potential has received less attention. 20 chronic musculoskeletal pain patients and 20 healthy controls were divided into lean and overweight subgroups according to their BMI. Current level of chronic pain (visual analogue scale) and pressure pain thresholds (PPTs) in 16 predefined sites, classically described and tested as painful points on the lower body, were measured. Levels of reproductive hormone and lipid profiles were assessed by ELISA. Sperm concentration and motility parameters were analyzed using a computer-aided sperm analysis system. Sperm concentration, progressive motility, and percentage of hyperactivated sperm were generally lower in the chronic pain patients in both lean and overweight groups. The overweight control and the lean chronic pain groups demonstrated a significantly lower percentage of progressively motile sperm compared with the lean control group, suggesting that musculoskeletal chronic pain may have a negative influence on sperm quality in lean patients. However, due to the potential great negative influence of obesity on the sperm parameters, it is difficult to propose if musculoskeletal chronic pain also influenced sperm quality in overweight patients. Further research in chronic pain patients is required to test this hypothesis.
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18
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Yeste M, Bonet S, Rodríguez-Gil JE, Rivera Del Álamo MM. Evaluation of sperm motility with CASA-Mot: which factors may influence our measurements? Reprod Fertil Dev 2018. [DOI: 10.1071/rd17475] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Computer-aided sperm analysis (CASA) is now routinely used in IVF clinics, animal breeding centres and research laboratories. Although CASA provides a more objective way to evaluate sperm parameters, a significant number of factors can affect these measurements. This paper classifies these factors into four categories: (1) sample and slide (e.g. preincubation time, type of specimen and type of chamber slide); (2) microscope (e.g. light source and microscope stage); (3) hardware and software, including the settings of each system; and (4) user-related factors. We review the effects of the different factors in each category on the measurements made and emphasise the need to take measures to standardise evaluations. The take-home message of the present article is that there are several commercial and useful CASA systems, and all are appropriate for routine analysis. Non-commercial systems may also be good choices when the user needs to adapt the device to specific experimental conditions. In both cases (commercial and non-commercial), it is important that standard protocols are put in place for evaluation, as well as methods to validate the system.
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19
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Dearing CG, Jayasena CN, Lindsay KS. Human sperm cryopreservation in cancer patients: Links with deprivation and mortality. Cryobiology 2017; 79:9-13. [PMID: 29031884 DOI: 10.1016/j.cryobiol.2017.10.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 10/11/2017] [Accepted: 10/11/2017] [Indexed: 11/24/2022]
Abstract
Evidence is mounting for a relationship between human semen quality and environmental/lifestyle/socioeconomic factors including long term health outcomes such as mortality. The relationship between pre-freeze and post-thaw semen quality in cancer patients and these factors are unknown. Frozen semen from 217 cancer patients was thawed and analysed using a validated CASA method. Post-thaw quality was matched and compared with WHO semen analysis performed prior to storage. The English Indices of Deprivation 2010 were matched with patients and then examined for relationships with pre-freeze and post-thaw semen quality. There is a relationship between semen quality and deprivation in cancer patients. Compared with pre-freeze semen quality, post-thaw semen quality has a stronger relationship with deprivation. Sperm cryopreservation may have potential as a systemic health diagnostic test and is predictive of cancer patient mortality.
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Affiliation(s)
- Chey G Dearing
- School of Health & Sports Science and School of Nursing, School of Viticulture, Eastern Institute of Technology, Taradale Campus, Hawkes Bay, 4112, New Zealand.
| | - Channa N Jayasena
- Andrology Laboratory, Hammersmith Hospital, Imperial College NHS Trust, London, W120HS2, United Kingdom
| | - Kevin S Lindsay
- Andrology Laboratory, Hammersmith Hospital, Imperial College NHS Trust, London, W120HS2, United Kingdom
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20
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Dearing CG, Lindsay KS. Corrected cholesterol, a novel marker for predicting semen post-thaw quality: a pilot study. HUM FERTIL 2017; 22:94-103. [DOI: 10.1080/14647273.2017.1382732] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Chey G. Dearing
- School of Health & Sport Science and School of Nursing, School of Viticulture, Eastern Institute of Technology, Hawkes Bay, New Zealand
| | - Kevin S. Lindsay
- Andrology Laboratory, Hammersmith Hospital, Imperial College NHS Trust, London, UK
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21
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Alipour H, Van Der Horst G, Christiansen O, Dardmeh F, Jørgensen N, Nielsen H, Hnida C. Improved sperm kinematics in semen samples collected after 2 h versus 4–7 days of ejaculation abstinence. Hum Reprod 2017; 32:1364-1372. [DOI: 10.1093/humrep/dex101] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2016] [Accepted: 04/29/2017] [Indexed: 11/13/2022] Open
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22
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Freour T. Automated and manual sperm analysis: united we stand, divided we fall. Andrologia 2015; 47:725-6. [PMID: 26234376 DOI: 10.1111/and.12413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Affiliation(s)
- T Freour
- Andrology laboratory and IVF unit, Department of Reproductive Medicine, University Hospital of Nantes, Nantes, France. .,Faculty of Medicine, University of Nantes, Nantes, France. .,INSERM UMR 1064, Nantes, France.
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