1
|
Jassam N, Bancroft T, Luvai A, Mbagaya W, Barth JH. Vitamin B12 reference intervals on Beckman, Roche and Siemens analytical platforms. Ann Clin Biochem 2023; 60:417-422. [PMID: 37669635 DOI: 10.1177/00045632231202211] [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] [Indexed: 09/07/2023]
Abstract
BACKGROUND Vitamin B12 status is assessed primarily by measuring total serum B12 using competitive binding methods. The lack of availability of a standard material and high-level reference measurement procedure affect the trueness of B12 results; this results in variation between methods. This study aimed to determine the reference intervals for vitamin B12 on three routine analytical platforms. METHOD A prospective reference population of healthy individuals was recruited according to the IFCC CRIDL criteria. Vitamin B12 samples were measured on Roche, Beckman and Siemens analytical platforms. RESULTS In total, 300 adult subjects were recruited; the central 95th centile values for B12 for Roche (190-678 ng/mL) and Siemens (181-562 ng/mL) analytical platforms were in a close agreement. Beckman DXi, however, showed a significantly lower reference limit (110-562 ng/mL). All reference intervals are in keeping with previously published data but some are not in agreement with manufacturer provided reference interval. CONCLUSION As the quality of the reference intervals plays a significant role in clinical outcome, it is of great importance that laboratories use a method-specific reference interval and if possible, locally derived reference intervals until further method standardization occurs.
Collapse
Affiliation(s)
- Nuthar Jassam
- Department of Clinical Biochemistry, Harrogate Foundation Trust, Harrogate, UK
| | - Thomas Bancroft
- Department of Clinical Biochemistry, Harrogate Foundation Trust, Harrogate, UK
| | - Ahai Luvai
- Specialist Laboratory Medicine, St James Hospital, Leeds Teaching Hospitals, Leeds, UK
| | - Wycliffe Mbagaya
- Specialist Laboratory Medicine, St James Hospital, Leeds Teaching Hospitals, Leeds, UK
| | - Julian H Barth
- Specialist Laboratory Medicine, St James Hospital, Leeds Teaching Hospitals, Leeds, UK
| |
Collapse
|
2
|
Carrero JJ, Fu EL, Sang Y, Ballew S, Evans M, Elinder CG, Barany P, Inker LA, Levey AS, Coresh J, Grams ME. Discordances Between Creatinine- and Cystatin C-Based Estimated GFR and Adverse Clinical Outcomes in Routine Clinical Practice. Am J Kidney Dis 2023; 82:534-542. [PMID: 37354936 DOI: 10.1053/j.ajkd.2023.04.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2022] [Accepted: 04/11/2023] [Indexed: 06/26/2023]
Abstract
RATIONALE & OBJECTIVE Cystatin C is recommended for measuring estimated glomerular filtration rate (eGFR) when estimates based on creatinine (eGFRcr) are not thought to be accurate enough for clinical decision making. While global adoption is slow, routine cystatin C testing in Sweden has been available for over a decade, providing real-world evidence about the magnitude of differences between eGFRcys and eGFRcr and their association with clinical outcomes. STUDY DESIGN Observational study. SETTING & PARTICIPANTS 158,601 adults (48% women; mean age 62 years, eGFRcr 80, and eGFRcys 73mL/min/1.73/m2) undergoing testing for creatinine and cystatin C on the same day in connection with a health care encounter during 2010-2018 in Stockholm, Sweden. EXPOSURE Percentage difference of eGFRcys minus eGFRcr (eGFRdiff). OUTCOME Kidney failure with replacement therapy (KFRT), acute kidney injury (AKI), atherosclerotic cardiovascular disease (ASCVD), heart failure, and death. ANALYTICAL APPROACH Multivariable Cox proportional hazards regression. RESULTS Discordances between eGFRcr and eGFRcys were common, with eGFRcys being lower than eGFRcr (negative eGFRdiff) in most cases (65%). Patients with larger negative eGFRdiff were older, more often female, with higher eGFRcr and albuminuria, and more comorbid conditions. Compared with patients with similar eGFRcys and eGFRcr, the lowest quartile (eGFRcys > 27% lower than eGFRcr) had the higher HR of all study outcomes: AKI, 2.6 (95% CI, 2.4-2.9); KFRT, 1.4 (95% CI, 1.2-1.6); ASCVD, 1.4 (95% CI, 1.3-1.5); heart failure, 2.0 (95% CI, 1.9-2.2); and all-cause death, 2.6 (95% CI, 2.5-2.7). Conversely, patients in the highest quartile (positive eGFRdiff) were at lower risk. LIMITATIONS Observational study, lack of information on indications for cystatin C testing. CONCLUSIONS Cystatin C testing in routine care shows that many patients have a lower eGFRcys than eGFRcr, and these patients have a higher risk of multiple adverse outcomes. PLAIN-LANGUAGE SUMMARY Clinicians require guidance when there are discrepancies between the estimated glomerular filtration rate based on creatinine (eGFRcr) and based on cystatin C (eGFRcys) in the same individual. Routine cystatin C testing in Sweden for over a decade permits exploration of how common and large these discrepancies are, and their associations with adverse clinical outcomes. In this observational study, we found that discordances between eGFRcys and eGFRcr are common, and 1 in 4 patients tested had an eGFRcys > 28% lower than their eGFRcr. We also show that an eGFRcys that is lower than the eGFRcr consistently identifies patients at higher risk of adverse outcomes, including cardiovascular events, kidney replacement therapy, acute kidney injury, and death.
Collapse
Affiliation(s)
- Juan-Jesús Carrero
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Division of Nephrology, Department of Clinical Sciences, Danderyd Hospital, Karolinska Institutet, Stockholm, Sweden.
| | - Edouard L Fu
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, Massachusetts
| | - Yingying Sang
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Shoshana Ballew
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Marie Evans
- Department of Clinical Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
| | - Carl-Gustaf Elinder
- Department of Clinical Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
| | - Peter Barany
- Department of Clinical Intervention and Technology, Karolinska Institutet, Stockholm, Sweden
| | - Lesley A Inker
- Division of Nephrology, Tufts Medical Center, Boston, Massachusetts
| | - Andrew S Levey
- Division of Nephrology, Tufts Medical Center, Boston, Massachusetts
| | - Josef Coresh
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland
| | - Morgan E Grams
- Department of Medicine, Grossman School of Medicine, New York University, New York, New York
| |
Collapse
|
3
|
Ni X, Liu L, Yao Y, Zhang C, Su H, Lv Y, Li R, Sun L, Zhou Q, Zhu X, Yang Z, Chen Z, He W, Zhu H, Zhang S, Hu C, Yuan H. The genetic correlation and causal association between key factors that influence vascular calcification and cardiovascular disease incidence. Front Cardiovasc Med 2023; 10:1096662. [PMID: 36776247 PMCID: PMC9908996 DOI: 10.3389/fcvm.2023.1096662] [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: 11/12/2022] [Accepted: 01/13/2023] [Indexed: 01/27/2023] Open
Abstract
Background Serum calcium (Ca), vitamin D (VD), and vitamin K (VK) levels are key determinants of vascular calcification, which itself impacts cardiovascular disease (CVD) risk. The specific relationships between the levels of these different compounds and particular forms of CVD, however, remain to be fully defined. Objective This study was designed to explore the associations between these serum levels and CVDs with the goal of identifying natural interventions capable of controlling vascular calcification and thereby protecting against CVD pathogenesis, extending the healthy lifespan of at-risk individuals. Methods Linkage disequilibrium score (LDSC) regression and a two-sample Mendelian randomization (MR) framework were leveraged to systematically examine the causal interplay between these serum levels and nine forms of CVD, as well as longevity through the use of large publically accessible Genome-Wide Association Studies (GWAS) datasets. The optimal concentrations of serum Ca and VD to lower CVD risk were examined through a restrictive cubic spline (RCS) approach. Results After Bonferroni correction, the positive genetic correlations were observed between serum Ca levels and myocardial infarction (MI) (p = 1.356E-04), as well as coronary artery disease (CAD) (p = 3.601E-04). Negative genetic correlations were detected between levels of VD and CAD (p = 0.035), while elevated VK1 concentrations were causally associated with heart failure (HF) [odds ratios (OR) per 1-standard deviation (SD) increase: 1.044], large artery stroke (LAS) (OR per 1-SD increase: 1.172), and all stroke (AS) (OR per 1-SD increase: 1.041). Higher serum Ca concentrations (OR per 1-SD increase: 0.865) and VD levels (OR per 1-SD increase: 0.777) were causally associated with reduced odds of longevity. These findings remained consistent in sensitivity analyses, and serum Ca and VD concentrations of 2.376 mmol/L and 46.8 nmol/L, respectively, were associated with a lower CVD risk (p < 0.001). Conclusion Our findings support a genetic correlation between serum Ca and VD and CVD risk, and a causal relationship between VK1 levels and CVD risk. The optimal serum Ca (2.376 mmol/L) and VD levels (46.8 nmol/L) can reduce cardiovascular risk.
Collapse
Affiliation(s)
- Xiaolin Ni
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital, National Center of Gerontology of National Health Commission, Beijing, China,State Key Laboratory of Stem Cell and Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China,Institute for Stem Cell and Regeneration, Chinese Academy of Sciences, Beijing, China
| | - Lei Liu
- Department of Medical Microbiology and Infection Prevention, University Medical Center Groningen, University of Groningen, Groningen, Netherlands
| | - Yao Yao
- China Center for Health Development Studies, Peking University, Beijing, China
| | - Chi Zhang
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital, National Center of Gerontology of National Health Commission, Beijing, China
| | | | - Yuan Lv
- Jiangbin Hospital, Zhenjiang, China
| | | | - Liang Sun
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital, National Center of Gerontology of National Health Commission, Beijing, China
| | - Qi Zhou
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital, National Center of Gerontology of National Health Commission, Beijing, China
| | - Xiaoquan Zhu
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital, National Center of Gerontology of National Health Commission, Beijing, China
| | - Ze Yang
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital, National Center of Gerontology of National Health Commission, Beijing, China
| | - Zuoguan Chen
- Department of Vascular Surgery, Beijing Hospital, National Center of Gerontology, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences Peking Union Medical College, Beijing, China
| | - Wei He
- Department of Cardiology, Beijing Hospital, National Center of Gerontology, Beijing, China
| | - Huolan Zhu
- Department of Geriatrics, Shaanxi Provincial Clinical Research Center for Geriatric Medicine, Shaanxi Provincial People’s Hospital, Xi’an, China
| | - Shenqi Zhang
- Department of Joint and Sports Medicine, Zaozhuang Municipal Hospital Affiliated to Jining Medical University, Zaozhuang, Shandong, China
| | - Caiyou Hu
- Jiangbin Hospital, Zhenjiang, China,Caiyou Hu,
| | - Huiping Yuan
- The Key Laboratory of Geriatrics, Beijing Institute of Geriatrics, Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing Hospital, National Center of Gerontology of National Health Commission, Beijing, China,*Correspondence: Huiping Yuan,
| |
Collapse
|
4
|
Broecker-Preuss M, Arzideh F, Best J, Canbay A, Özçürümez M, Manka P. Comparison of age- and sex-dependent reference limits derived from distinct sources for metabolic measurands in basic liver diagnostics. ZEITSCHRIFT FUR GASTROENTEROLOGIE 2023; 61:50-59. [PMID: 36623543 DOI: 10.1055/a-1994-0809] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Reference intervals for basic liver laboratory diagnostic rely on manufacturers' information, remaining unchanged for more than 20 years. This ignores known age and sex dependencies. METHODS We performed a retrospective cross-sectional study to compare the age-dependent distribution of flagged and non-flagged laboratory findings between reference limits from 3 distinct sources: manufacturer, published reference study, and the truncated maximum likelihood method applied on a cohort of inpatients aged 18-100 years. Discordance rates adjusted for the permissible analytical uncertainty are reported for serum levels of albumin (n= 150,550), alkaline phosphatase (n= 433,721), gamma-GT (n=580,012), AST (n= 510,620), and ALT (n= 704,546). RESULTS The number of flagged findings differed notably between reference intervals compared, except for alkaline phosphatase. AST and alkaline phosphatase increased with age in women. Overall discordance for AP, AST, and ALT remained below 10%, respectively, in both sexes. Albumin decreased with age which led to discordant flags in up to 22% in patients ≥70 years. GGT and ALT peaked in 50-59-year-old men with up to 23.5% and 22.8% discordant flags, respectively. CONCLUSION We assessed the impact of different reference limits on liver related laboratory results and found up to 25 % discordant flags. We suggest to further analyse the diagnostic and economic effects of reference limits adapted to the population of interest even for well-established basic liver diagnostics.
Collapse
Affiliation(s)
- Martina Broecker-Preuss
- Medizinische Klinik, Universitätsklinikum Knappschaftskrankenhaus Bochum, Ruhr-Universität Bochum, Bochum, Germany
| | - Farhad Arzideh
- Medizinische Klinik, Universitätsklinikum Knappschaftskrankenhaus Bochum, Ruhr-Universität Bochum, Bochum, Germany
| | - Jan Best
- Medizinische Klinik, Universitätsklinikum Knappschaftskrankenhaus Bochum, Ruhr-Universität Bochum, Bochum, Germany
| | - Ali Canbay
- Medizinische Klinik, Universitätsklinikum Knappschaftskrankenhaus Bochum, Ruhr-Universität Bochum, Bochum, Germany
| | - Mustafa Özçürümez
- Medizinische Klinik, Universitätsklinikum Knappschaftskrankenhaus Bochum, Ruhr-Universität Bochum, Bochum, Germany
| | - Paul Manka
- Medizinische Klinik, Universitätsklinikum Knappschaftskrankenhaus Bochum, Ruhr-Universität Bochum, Bochum, Germany
| |
Collapse
|
5
|
Deodatus JA, Kooistra SA, Kurstjens S, Mossink JCL, van Dijk JD, Groeneveld PHP, van der Kolk B(BYM. Lower plasma calcium associated with COVID-19, but not with disease severity: a two-centre retrospective cohort study. Infect Dis (Lond) 2022; 54:90-98. [PMID: 34586002 PMCID: PMC8500306 DOI: 10.1080/23744235.2021.1981549] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 09/08/2021] [Accepted: 09/12/2021] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Previous studies indicate hypocalcaemia as a potential diagnostic and prognostic marker of corona-virus disease 2019 (COVID-19). Our aim was to investigate these relations in more detail in a large test cohort and an independent validation cohort. METHODS We retrospectively included 2792 COVID-19 suspected patients that presented to the emergency department (ED) of two hospitals. Plasma calcium and ionized plasma calcium levels were compared between COVID-19 positive and negative patients, and between severe and non-severe COVID-19 patients using univariate and multivariate analyses in the first hospital (N = 1363). Severe COVID-19 was defined as intensive care unit (ICU) admission or death within 28 d after admission. The results were validated by repeating the same analyses in the second hospital (N = 1429). RESULTS A total of 693 (24.8%) of the enrolled patients were COVID-19 positive, of whom 238 (34.3%) had severe COVID-19. In both hospitals, COVID-19 positive patients had lower plasma calcium levels than COVID-19 negative patients, regardless of correction for albumin, in univariate and multivariate analysis (Δ0.06-0.13 mmol/L, p < .001). Ionized plasma calcium concentrations, with and without correction for pH, were also lower in COVID-19 positive patients in multivariate analyses (Δ0.02-0.05 mmol/L, N = 567, p < .001). However, we did not find a significant association between COVID-19 disease severity and plasma calcium in multivariate analyses. CONCLUSIONS Plasma calcium concentrations were lower in COVID-19 positive than COVID-19 negative patients but we found no association with disease severity in multivariate analyses. Further understanding of plasma calcium perturbation may facilitate the development of new preventive and therapeutic modalities for the current pandemic.
Collapse
|
6
|
Yang D, Su Z, Zhao M. Big data and reference intervals. Clin Chim Acta 2022; 527:23-32. [PMID: 34999059 DOI: 10.1016/j.cca.2022.01.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 12/29/2021] [Accepted: 01/03/2022] [Indexed: 12/12/2022]
Abstract
Although reference intervals (RIs) play an important role in clinical diagnosis, there remain significant differences with respect to race, gender, age and geographic location. Accordingly, the Clinical Laboratory Standards Institute (CLSI) EP28-A3c has recommended that clinical laboratories establish RIs appropriate to their subject population. Unfortunately, the traditional and direct approach to establish RIs relies on the recruitment of a sufficient number of healthy individuals of various age groups, collection and testing of large numbers of specimens and accurate data interpretation. The advent of the big data era has, however, created a unique opportunity to "mine" laboratory information. Unfortunately, this indirect method lacks standardization, consensus support and CLSI guidance. In this review we provide a historical perspective, comprehensively assess data processing and statistical methods, and post-verification analysis to validate this big data approach in establishing laboratory specific RIs.
Collapse
Affiliation(s)
- Dan Yang
- National Clinical Research Center for Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, PR China; Department of Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, PR China; Units of Medical Laboratory, Chinese Academy of Medical Sciences, PR China
| | - Zihan Su
- National Clinical Research Center for Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, PR China; Department of Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, PR China; Units of Medical Laboratory, Chinese Academy of Medical Sciences, PR China
| | - Min Zhao
- National Clinical Research Center for Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, PR China; Department of Laboratory Medicine, The First Affiliated Hospital of China Medical University, Shenyang, PR China; Units of Medical Laboratory, Chinese Academy of Medical Sciences, PR China.
| |
Collapse
|
7
|
Jassam N. Population-specific adjusted calcium equations. Ann Clin Biochem 2021; 59:383-384. [PMID: 34727515 DOI: 10.1177/00045632211051181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Affiliation(s)
- Nuthar Jassam
- Department of Clinical Biochemistry, 3746Harrogate and District NHS Foundation Trust, Harrogate, UK
| |
Collapse
|
8
|
Jassam N, Barth JH. Adjusted calcium reference interval harmonization. Clin Endocrinol (Oxf) 2021; 94:725-726. [PMID: 33131109 DOI: 10.1111/cen.14363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 10/23/2020] [Accepted: 10/28/2020] [Indexed: 11/29/2022]
Affiliation(s)
- Nuthar Jassam
- Department of Clinical Biochemistry, Harrogate Foundation Trust, Harrogate, UK
| | - Julian H Barth
- Department of Clinical Biochemistry, Leeds Teaching Hospitals Trust, Leeds, UK
| |
Collapse
|
9
|
Affiliation(s)
- Gethin Roberts
- Hywel Dda University Health Board, Llwyn Helyg, Rhydyfelin, Aberystwyth, UK
| |
Collapse
|