Q J Med 1999; 92: 169-173
© 1999 Association of Physicians
Age does not influence levels of HbA1c in normal subject
From the Department of Clinical Biochemistry, North Manchester General Hospital, Manchester, and 1 Department of Clinical Chemistry, Royal Liverpool University Hospital, Liverpool, UK
Received 17 April 1998 and in revised form 11 December 1998
Dr K. Wiener, Department of Clinical Biochemistry, North Manchester General Hospital, Delaunays Road, Crumpsall, Manchester M8 5RB
To resolve whether haemoglobin A1c(HbA1c) levels in normal subjects increase with age, we measured HbA1c in 399 patients undergoing routine oral glucose tolerance test (OGTT). The OGTT results categorized the patients into 127 normal, 94 impaired glucose tolerance (IGT) and 178 diabetic. None of these groups showed a significant correlation between HbA1c and age and we cannot, therefore, see a need for age-specific reference ranges for HbA1c. Some of the confusion in the literature may have arisen from less rigorous categorization of subjects than we used, resulting in the inclusion of some individuals with IGT or diabetes in the `normal' groups of other studies. The prevalence of such abnormality would be expected to be greater amongst older subjects, falsely suggesting a correlation between HbA1c and age, and we were able to demonstrate this with our own data when insufficiently rigorous criteria were applied for the selection of normal subjects.
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