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Measurement of HbA1c from stored whole blood samples in the Atherosclerosis Risk in Communities study.

TitleMeasurement of HbA1c from stored whole blood samples in the Atherosclerosis Risk in Communities study.
Publication TypeJournal Article
Year of Publication2010
AuthorsSelvin E, Coresh J, Zhu H, Folsom A, Steffes MW
JournalJ Diabetes
Volume2
Issue2
Pagination118-24
Date Published2010 Jun
ISSN1753-0407
KeywordsAtherosclerosis, Chromatography, High Pressure Liquid, Drug Storage, Glycated Hemoglobin A, Humans, Nutrition Surveys, Reproducibility of Results, Risk Assessment, Time Factors, United States
Abstract

BACKGROUND: The aims of the present study were to demonstrate the reliability of HbA1c measurements during two time periods and to compare these measurements with HbA1c distribution in the general US population.

METHODS: HbA1c was measured in 14,069 whole blood samples in the Atherosclerosis Risk in Communities (ARIC) study using different HPLC instruments across two time periods, namely 2003-2004 and 2007-2008. At the time of measurement, samples had been in storage at -70°C for up to 18 years. To assess differences in values, HbA1c measurements were repeated in 383 samples at both periods. Indirect comparisons were made by comparing our measurements against those from a nationally representative study.

RESULTS: The coefficients of variation for quality control samples were 1.8% (n = 89) in 2003-2004 and 1.4% (n = 259) in 2007-2008. The correlation between measurements at the two time points was high (r = 0.99), but with a slight bias: 0.29% points higher in 2007-2008 vs 2003-2004 (n = 383; P

CONCLUSIONS: Measurements of HbA1c from samples stored for up to 18 years are highly reliable when using state-of-the-art HPLC instruments, but with some bias introduced over time. The HbA1c data now available in the ARIC study should be invaluable for investigations into the clinical utility of HbA1c as a diagnostic test for diabetes.

DOI10.1111/j.1753-0407.2010.00070.x
Alternate JournalJ Diabetes
PubMed ID20923494
PubMed Central IDPMC2991637
Grant ListN01HC55020 / HL / NHLBI NIH HHS / United States
N01HC55018 / HL / NHLBI NIH HHS / United States
K01 DK076595-03 / DK / NIDDK NIH HHS / United States
N01-HC-55022 / HC / NHLBI NIH HHS / United States
N01-HC-55016 / HC / NHLBI NIH HHS / United States
K01 DK076595-04 / DK / NIDDK NIH HHS / United States
N01HC55022 / HL / NHLBI NIH HHS / United States
N01-HC-55021 / HC / NHLBI NIH HHS / United States
N01HC55015 / HL / NHLBI NIH HHS / United States
K01 DK076595 / DK / NIDDK NIH HHS / United States
N01-HC-55019 / HC / NHLBI NIH HHS / United States
K01 DK076595-05 / DK / NIDDK NIH HHS / United States
N01-HC-55015 / HC / NHLBI NIH HHS / United States
R21 DK080294-01 / DK / NIDDK NIH HHS / United States
K01 DK076595-01 / DK / NIDDK NIH HHS / United States
N01-HC-55020 / HC / NHLBI NIH HHS / United States
N01HC55016 / HL / NHLBI NIH HHS / United States
N01HC55019 / HL / NHLBI NIH HHS / United States
R21 DK080294-02 / DK / NIDDK NIH HHS / United States
K01 DK076595-02 / DK / NIDDK NIH HHS / United States
R21 DK080294 / DK / NIDDK NIH HHS / United States
N01-HC-55018 / HC / NHLBI NIH HHS / United States
N01HC55021 / HL / NHLBI NIH HHS / United States