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Liu X, Wang Z, Wang X, Liu J, Waigi MG. Conversion of estriol to estrone: A bacterial strategy for the catabolism of estriol. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 280:116564. [PMID: 38865939 DOI: 10.1016/j.ecoenv.2024.116564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/10/2024] [Accepted: 06/04/2024] [Indexed: 06/14/2024]
Abstract
Natural estrogens, including estrone (E1), 17β-estradiol (E2), and estriol (E3), are potentially carcinogenic pollutants commonly found in water and soil environments. Bacterial metabolic pathway of E2 has been studied; however, the catabolic products of E3 have not been discovered thus far. In this study, Novosphingobium sp. ES2-1 was used as the target strain to investigate its catabolic pathway of E3. The metabolites of E3 were identified by high performance liquid chromatography-high resolution mass spectrometry (HPLC-HRMS) combined with stable 13C3-labeling. Strain ES2-1 could almost completely degrade 20 mg∙L-1 of E3 within 72 h under the optimal conditions of 30°C and pH 7.0. When inoculated with strain ES2-1, E3 was initially converted to E1 and then to 4-hydroxyestrone (4-OH-E1), which was then cleaved to HIP (metabolite A6) via the 4, 5-seco pathway or cleaved to the B loop via the 9,10-seco pathway to produce metabolite with a long-chain ketone structure (metabolite B4). Although the ring-opening sequence of the above two metabolic pathways was different, the metabolism of E3 was achieved especially through continuous oxidation reactions. This study reveals that, E3 could be firstly converted to E1 and then to 4-OH-E1, and finally degraded into small molecule metabolites through two alternative pathways, thereby reducing E3 pollution in water and soil environments.
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Affiliation(s)
- Xiangyu Liu
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Zeming Wang
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Xiu Wang
- Institute of Animal Husbandry and Poultry Science, Nanjing 210017, PR China
| | - Juan Liu
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
| | - Michael Gatheru Waigi
- Institute of Organic Contaminant Control and Soil Remediation, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, PR China
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Okano M, Shiomura S. Effectiveness of blood steroidal passport markers for detecting testosterone abuse in Asians. Drug Test Anal 2024; 16:595-603. [PMID: 37848395 DOI: 10.1002/dta.3588] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 09/30/2023] [Accepted: 10/03/2023] [Indexed: 10/19/2023]
Abstract
The World Anti-Doping Agency (WADA) has introduced an Athlete Biological Passport (ABP) with a steroidal module, which is intended for the monitoring of longitudinal profiles of an athlete's steroid variables in urine to identify endogenous anabolic androgenic steroids that are administered exogenously. It has been in use since 2014. The prevalence of UGT2B17 gene deletion with relatively low levels of testosterone (T) glucuronide in urine is high in the Asian region. There are cases in which urinary T is below the detection limit in specific urine samples, for example, diluted urine, urine collected from females, or urine collected from UGT2B17 deletion individuals. Additional steroid markers T, 4-androstenedione (A4), and the T/A4 ratio in serum were newly added to the ABP steroidal module by WADA in 2023 to compensate for the urine steroid profile. In this study, populations of blood steroid markers in Asians (n = 510) were investigated and classified according to UGT2B17 polymorphism to confirm the effectiveness of blood steroid markers in monitoring Asian athletes. No significant difference in the T/A4 ratio was observed between the genotypes. Furthermore, an administration study of T enanthate in females (n = 10) who were classified according to UGT2B17 genotypes was performed. The concentration of T and the T/A4 ratio were found to be significantly increased in all post-administration samples until 15 days after administration (p < 0.01). The overall results supported the high effectiveness of subject-based monitoring for serum T and T/A4 ratio for recently identified shortcomings in the detection of T abuse in Asians.
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Affiliation(s)
- Masato Okano
- Anti-Doping Laboratory, LSI Medience Corporation, Tokyo, Japan
| | - Sho Shiomura
- Anti-Doping Laboratory, LSI Medience Corporation, Tokyo, Japan
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3
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Fanelli F, Peitzsch M, Bruce S, Cantù M, Temchenko A, Mezzullo M, Lindner JM, Hawley JM, Ackermans MT, Van den Ouweland J, Koeppl D, Nardi E, MacKenzie F, Binz PA, Rauh M, Keevil BG, Vogeser M, Eisenhofer G, Heijboer AC, Pagotto U. Report from the HarmoSter study: different LC-MS/MS androstenedione, DHEAS and testosterone methods compare well; however, unifying calibration is a double-edged sword. Clin Chem Lab Med 2024; 62:1080-1091. [PMID: 38205643 DOI: 10.1515/cclm-2023-1138] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Accepted: 12/26/2023] [Indexed: 01/12/2024]
Abstract
OBJECTIVES Current liquid chromatography-tandem mass spectrometry (LC-MS/MS) applications for circulating androgen measurements are technically diverse. Previously, variable results have been reported for testosterone. Data are scarce for androstenedione and absent for dehydroepiandrosterone sulfate (DHEAS). We assessed the agreement of androstenedione, DHEAS and testosterone LC-MS/MS measurements among nine European centers and explored benefits of calibration system unification. METHODS Androgens were measured twice by laboratory-specific procedures in 78 patient samples and in EQA materials. Results were obtained by in-house and external calibration. Intra- and inter-laboratory performances were valued. RESULTS Intra-laboratory CVs ranged between 4.2-13.2 % for androstenedione, 1.6-10.8 % for DHEAS, and 4.3-8.7 % and 2.6-7.1 % for female and male testosterone, respectively. Bias and trueness in EQA materials were within ±20 %. Median inter-laboratory CV with in-house vs. external calibration were 12.0 vs. 9.6 % for androstenedione (p<0.001), 7.2 vs. 4.9 % for DHEAS (p<0.001), 6.4 vs. 7.6 % for female testosterone (p<0.001) and 6.8 and 7.4 % for male testosterone (p=0.111). Median bias vs. all laboratory median with in-house and external calibration were -13.3 to 20.5 % and -4.9 to 18.7 % for androstenedione, -10.9 to 4.8 % and -3.4 to 3.5 % for DHEAS, -2.7 to 6.5 % and -11.3 to 6.6 % for testosterone in females, and -7.0 to 8.5 % and -7.5 to 11.8 % for testosterone in males, respectively. CONCLUSIONS Methods showed high intra-laboratory precision but variable bias and trueness. Inter-laboratory agreement was remarkably good. Calibration system unification improved agreement in androstenedione and DHEAS, but not in testosterone measurements. Multiple components, such as commutability of calibrators and EQA materials and internal standard choices, likely contribute to inter-laboratory variability.
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Affiliation(s)
- Flaminia Fanelli
- Department of Medical and Surgical Sciences, Endocrinology Research Group, Center for Applied Biomedical Research, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Mirko Peitzsch
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Stephen Bruce
- Clinical Chemistry Laboratory, University Hospital of Lausanne (CHUV), Lausanne, Switzerland
| | - Marco Cantù
- Laboratory of Clinical Biochemistry and Pharmacology, Institute of Laboratory Medicine EOLAB, Ente Ospedaliero Cantonale, Bellinzona, Switzerland
| | - Anastasia Temchenko
- Department of Medical and Surgical Sciences, Endocrinology Research Group, Center for Applied Biomedical Research, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Marco Mezzullo
- Department of Medical and Surgical Sciences, Endocrinology Research Group, Center for Applied Biomedical Research, Alma Mater Studiorum University of Bologna, Bologna, Italy
| | - Johanna M Lindner
- Institute of Laboratory Medicine, Hospital of the University of Munich (LMU), Munich, Germany
| | - James M Hawley
- Department of Clinical Biochemistry, University Hospital South Manchester, Manchester NHS Foundation Trust, Manchester, UK
| | - Mariette T Ackermans
- Faculty of Science, Van't Hoff Institute for Molecular Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Jody Van den Ouweland
- Department of Clinical Chemistry, Canisius-Wilhelmina Hospital, Nijmegen, Netherlands
| | - Daniel Koeppl
- Department of Pediatrics and Adolescent Medicine, University Hospital, Erlangen, Germany
| | - Elena Nardi
- Department of Medical and Surgical Sciences, Alma Mater Studiorum University of Bologna, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
| | - Finlay MacKenzie
- University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - Pierre-Alain Binz
- Clinical Chemistry Laboratory, University Hospital of Lausanne (CHUV), Lausanne, Switzerland
| | - Manfred Rauh
- Department of Pediatrics and Adolescent Medicine, University Hospital, Erlangen, Germany
| | - Brian G Keevil
- Department of Clinical Biochemistry, University Hospital South Manchester, Manchester NHS Foundation Trust, Manchester, UK
| | - Michael Vogeser
- Institute of Laboratory Medicine, Hospital of the University of Munich (LMU), Munich, Germany
| | - Graeme Eisenhofer
- Institute of Clinical Chemistry and Laboratory Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Annemieke C Heijboer
- Endocrine Laboratory, Department of Clinical Chemistry, Amsterdam UMC, University of Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - Uberto Pagotto
- Department of Medical and Surgical Sciences, Endocrinology Research Group, Center for Applied Biomedical Research, Alma Mater Studiorum University of Bologna, Bologna, Italy
- Unit of Endocrinology and Prevention and Care of Diabetes, IRCCS Azienda Ospedaliero-Universitaria di Bologna, Bologna, Italy
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Yu S, Zou Y, Ma X, Wang D, Luo W, Tang Y, Mu D, Zhang R, Cheng X, Qiu L. Evolution of LC-MS/MS in clinical laboratories. Clin Chim Acta 2024; 555:117797. [PMID: 38280490 DOI: 10.1016/j.cca.2024.117797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/22/2024] [Accepted: 01/22/2024] [Indexed: 01/29/2024]
Abstract
Liquid chromatography-tandem mass spectrometry (LC-MS/MS) has attracted significant attention in clinical practice owing to its numerous advantages. However, the widespread adoption of this technique is hindered by certain limitations, such as inappropriate analyte selection, low levels of automation, and a lack of specific reference intervals and quality control programs. This review comprehensively summarizes the current challenges associated with LC-MS/MS and proposes potential resolutions. The principle of utility should guide the selection of biomarkers, prioritizing their practical value over sheer quantity. To achieve full-process automation, methodological innovation is crucial for developing high-throughput equipment. Establishing reference intervals for mass spectrometry-based assays across multiple centers and diverse populations is essential for accurate result interpretation. Additionally, the development of commercial quality control materials assumes pivotal importance in ensuring assay reliability and reproducibility. Harmonization and standardization efforts should focus on the development of reference methods and materials for the clinical use of LC-MS/MS. In the future, commercial assay kits and laboratory-developed tests (LDTs) are expected to coexist in clinical laboratories, each offering distinct advantages. The collaborative efforts of diverse professionals is vital for addressing the challenges associated with the clinical application of LC-MS/MS. The anticipated advancements include simplification, increased automation, intelligence, and the standardization of LC-MS/MS, ultimately facilitating its seamless integration into clinical routines for both technicians and clinicians.
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Affiliation(s)
- Songlin Yu
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China
| | - Yutong Zou
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China
| | - Xiaoli Ma
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China
| | - Danchen Wang
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China
| | - Wei Luo
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China
| | - Yueming Tang
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China
| | - Danni Mu
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China
| | - Ruiping Zhang
- Department of Laboratory Medicine, China-Japan Friendship Hospital, Beijing, China
| | - Xinqi Cheng
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China.
| | - Ling Qiu
- Department of Laboratory Medicine, Peking Union Medical College Hospital, Peking Union Medical College & Chinese Academy of Medical Science, Beijing, China.
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Kobel A, Schierscher T, Singh N, Salzmann L, Liesch F, Bauland F, Geistanger A, Risch L, Geletneky C, Seger C, Taibon J. An isotope dilution-liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS)-based candidate reference measurement procedure for the quantification of levetiracetam in human serum and plasma. Clin Chem Lab Med 2023; 61:1967-1977. [PMID: 37011038 DOI: 10.1515/cclm-2022-1038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Accepted: 03/14/2023] [Indexed: 04/04/2023]
Abstract
OBJECTIVES To develop an isotope dilution-liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based candidate reference measurement procedure (RMP) for levetiracetam quantification in human serum and plasma. METHODS Quantitative nuclear magnetic resonance spectroscopy (qNMR) was used to characterize the RMP material to ensure traceability to SI units. To quantify levetiracetam, an LC-MS/MS method was optimized using a C8 column for chromatographic separation following protein-precipitation-based sample preparation. Spiked matrix samples of serum and plasma were used to test selectivity and specificity. Matrix effects were determined by performing a post-column infusion experiment and comparing standard line slopes. Precision and accuracy were evaluated over 5 days. Measurement uncertainty was evaluated according to the Guide to the Expression of Uncertainty in Measurement (GUM). RESULTS The RMP was proven to be highly selective and specific with no evidence of a matrix effect, allowing for quantification of levetiracetam within the range of 1.53-90.0 μg/mL. Intermediate precision was <2.2% and repeatability was 1.1-1.7% across all concentrations. The relative mean bias ranged from -2.5% to -0.3% across all levels and matrices within the measuring range. Diluted samples were found with a mean bias ranging from -0.1 to 2.9%. The predefined acceptance criterion for measurement uncertainty was met and determined for individual measurements independently of the concentration level and sample type to be ≤4.0% (k=2). CONCLUSIONS We present a novel LC-MS/MS)-based candidate RMP for levetiracetam in human serum and plasma. Its expanded measurement uncertainty of ≤4.0% meets the clinical needs in levetiracetam monitoring. Utilizing qNMR to characterize levetiracetam reference materials allowed metrological traceability to SI units.
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Affiliation(s)
- Anja Kobel
- Dr. Risch Ostschweiz AG, Buchs, Switzerland
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Fraissinet F, Pereira T, Violin A, Feugray G, Bach-Ngohou K, Brunel V. A novel fully-automated method to measure steroids in serum by liquid chromatography-tandem mass spectrometry. J Mass Spectrom Adv Clin Lab 2022; 27:24-32. [PMID: 36593910 PMCID: PMC9804132 DOI: 10.1016/j.jmsacl.2022.12.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 11/24/2022] [Accepted: 12/12/2022] [Indexed: 12/23/2022] Open
Abstract
Background Steroids play a key role in numerous physiological processes. Steroid determination is a useful tool to explore various endocrine diseases. Because of its specificity, mass spectrometry is considered to be a reference method for the determination of steroids in serum compared to radioimmunoassay. This technology could progress towards more automation for the optimal organization of clinical laboratories and ultimately for the benefit of patients. Methods A fully automated ultra-high-performance liquid chromatography-tandem mass spectrometry method was developed and fully validated to determine five steroids in serum. Sample preparation was based on protein precipitation with filtration followed by online solid phase extraction. Chromatographic separation was performed using a biphenyl stationary phase. Results The method was successfully validated according to European Medicine Agency guidelines. Coefficients of variation did not exceed, respectively, 8.4% and 8.1% for intra- and inter-assay precision. Method comparison with radioimmunoassay showed a proportional bias for all compounds, except for testosterone in men. Comparison with another LC-MS/MS method demonstrated acceptable concordance for all steroids, although a small bias was observed for androstenedione. Conclusion The novelty of this method is that it has been fully automated. Automation provides benefits in traceability and allows significant savings in cost and time.
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Key Words
- 11DF, 11-deoxycortisol
- 17OHP, 17-hydroxyprogesterone
- 2D-UHPLC-MS/MS, Two dimensional ultra-high performance liquid chromatography-tandem mass spectrometry
- Automation
- D4, delta4-androstenedione
- DHEA, dehydroepiandrosterone
- EMA, European Medicine Agency
- GC–MS/MS, Gas chromatography tandem mass spectrometry
- LC-MS/MS, Liquid chromatography tandem mass spectrometry
- LLE, Liquid-liquid extraction
- LLOQ, Lower limit of quantification
- Liquid chromatography tandem mass spectrometry
- MRM, Multiple reaction monitoring
- PTFE, Polytetrafluoroethylene
- QC, Quality control
- RIA, Radioimmunoassay
- Radioimmunoassay
- SLE, Supported liquid extraction
- SPE, Solid phase extraction
- SRM, Standard reference material
- Steroids
- T, Testosterone
- Testosterone
- UHPLC, Ultra-high performance liquid chromatography
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Affiliation(s)
- François Fraissinet
- Department of General Biochemistry, Rouen University Hospital, 76000 Rouen, France,Corresponding author.
| | - Tony Pereira
- Department of General Biochemistry, Rouen University Hospital, 76000 Rouen, France
| | - Alizée Violin
- Nantes Université, CHU Nantes, Department of Biology, Laboratory of Biochemistry, F-44000 Nantes, France
| | - Guillaume Feugray
- Department of General Biochemistry, Rouen University Hospital, 76000 Rouen, France,Normandie University, UNIROUEN, INSERM U1096 Rouen, France
| | - Kalyane Bach-Ngohou
- Nantes Université, CHU Nantes, Department of Biology, Laboratory of Biochemistry, F-44000 Nantes, France,Nantes Université, CHU Nantes, INSERM, The Enteric Nervous System in Gut and Brain Disorders, IMAD, F-44000 Nantes, France
| | - Valéry Brunel
- Department of General Biochemistry, Rouen University Hospital, 76000 Rouen, France
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Obermayer-Pietsch B, de Ramon M, Reichmuth C, Bendig G, Hutzler S, Taibon J, Rank CM, Findeisen P. Multicenter Evaluation of a New, Fully Automated Androstenedione Electrochemiluminescence Immunoassay: Precision Analysis, Method Comparison, and Determination of Reference Ranges. J Appl Lab Med 2021; 7:503-514. [PMID: 34662384 DOI: 10.1093/jalm/jfab107] [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: 02/11/2021] [Accepted: 07/26/2021] [Indexed: 11/12/2022]
Abstract
BACKGROUND Androstenedione (ASD) levels can aid diagnosis of hyperandrogenism together with other clinical/laboratory findings. We evaluated performance of the new, automated Elecsys® ASD assay vs an ASD isotope dilution-liquid chromatography-tandem mass spectrometry (ID-LC-MS/MS) reference measurement procedure and determined reference ranges. METHODS Repeatability/intermediate precision were assessed using 3 control levels and 5 human serum pools (n = 75 each; Clinical and Laboratory Standards Institute EP05-A3). Method comparisons vs commercially available immunoassays [IMMULITE ASD (Siemens) and LIAISON ASD (DiaSorin)] and an ID-LC-MS/MS measurement procedure method were conducted using 421 serum samples; Passing-Bablok regression and Pearson's correlation coefficients were calculated. Reference ranges and distribution of values associated with polycystic ovary syndrome (PCOS) were determined in five clinical cohorts using samples from several sites/vendors. RESULTS Repeatability/intermediate precision coefficients of variation across all sites were 2.01% to 3.91% and 2.43% to 4.30%, respectively (mean ASD: 7.80-34.7 nmol/L). The Elecsys ASD assay showed poor agreement with IMMULITE ASD (slope = 0.459; r = 0.856; n = 320), fair agreement with LIAISON ASD (slope = 0.625; r = 0.984; n = 327), and very good agreement with ID-LC-MS/MS (slope = 1.040; r = 0.996; n = 332). Reference ranges (2.5th-97.5th percentiles) were: children (≤8 years; n = 140), <0.525 to 1.81 nmol/L; males (≥18 years; n = 138), 0.979 to 5.32 nmol/L; and postmenopausal females (n = 140), 0.654 to 3.74 nmol/L. Reference range (5th-95th percentiles) for females with fertile cycle (≥18 years; n = 84) was 1.71 to 4.58 nmol/L. The distribution of values (2.5th-97.5th percentiles) in females with PCOS (n = 125) was 2.26 to 12.1 nmol/L. CONCLUSIONS Elecsys ASD assay demonstrated excellent precision and very good agreement with ID-LC-MS/MS. Reference ranges were established to support results interpretation in routine practice.
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Affiliation(s)
- Barbara Obermayer-Pietsch
- Department of Internal Medicine, Division of Endocrinology and Diabetology, Endocrinology Lab Platform, Medical University of Graz, Graz, Austria
| | - Marta de Ramon
- Clinical Biochemistry, Hormones and Tumor Markers Section, Laboratori de Referència de Catalunya, Barcelona, Spain
| | - Claudia Reichmuth
- Agent from TRIGA-S representing Roche Diagnostics GmbH, Penzberg, Germany
| | | | | | | | | | - Peter Findeisen
- Study Department, MVZ Labor Dr. Limbach & Kollegen, Heidelberg, Germany
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Schuster C, Habler K, Vogeser M. Effect of gravimetric correction and type of pipettes used in sample preparation on the precision of LC-MS/MS-based analyses. Clin Biochem 2021; 91:63-66. [PMID: 33581083 DOI: 10.1016/j.clinbiochem.2021.01.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 01/28/2021] [Accepted: 01/30/2021] [Indexed: 11/19/2022]
Abstract
BACKGROUND Currently, manual pipetting of human sample material is still a key process in sample preparation for chromatographic and mass spectrometric analyses in the clinical laboratory. In most cases, however, pipettes used in clinical laboratories are only specified for handling water-like liquids. Actual pipetted liquid volumes can be verified by weighing within the sample preparation process, and the results can be corrected accordingly (gravimetric correction). The aim of our study was to evaluate and compare the effects of gravimetric correction in terms of accuracy and precision for an air cushion and direct replacement pipette. METHODS Forty-fold serial determination of linezolid in a spiked serum sample by ID-LC-MS/MS was applied as an exemplary measurement procedure. Polypropylene tubes were weighed before the addition of 50 µL serum, after the addition, and after the addition of the internal standard solution. Coefficients of variation (CV) were calculated as an indicator of measurement precision. RESULTS The use of a direct replacement pipette was associated with improved measurement imprecision than an air cushion pipette (CV 1.70% vs 2.49% for serum, uncorrected results). The results obtained after gravimetric correction showed improved precision with the use of an air cushion pipette compared to the conventional approach (CV 1.51% vs 1.61%). Using a direct replacement pipette, the impact of gravimetric correction on imprecision was negligible. CONCLUSION Using direct replacement pipettes in sample preparation enables more precise ID-LC-MS/MS analyses than using air cushion pipettes. Gravimetric correction can be a useful tool to improve the precision of LC-MS/MS measurement procedures when complex matrices such as human serum are handled with commonly used air cushion pipettes.
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Affiliation(s)
- Carina Schuster
- Institute of Laboratory Medicine, University Hospital, LMU Munich, Germany.
| | - Katharina Habler
- Institute of Laboratory Medicine, University Hospital, LMU Munich, Germany
| | - Michael Vogeser
- Institute of Laboratory Medicine, University Hospital, LMU Munich, Germany
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