Since better glucose control reduces microvascular complications in patients with diabetes, reliable evaluation of diabetes control is essential. Hemoglobin A1c (HbA1c) values reflect average glucose over approximately 120 days (the average erythrocyte lifespan) and are a better assessment of glucose control than blood glucose measurement, which provides information at only one point of time. Although HbA1c is universally accepted as a means for monitoring diabetes control, its measurement is challenging. Concerns have been expressed about deficiencies of HbA1c analysis—most notably, lack of accuracy and inability to use HbA1c in subsets of individuals (eg, patients with hemolytic anemia or acute blood loss). This Viewpoint addresses some important considerations relevant to laboratory determination of HbA1c.
Sacks DB, John WG. Interpretation of Hemoglobin A1c Values. JAMA. 2014;311(22):2271-2272. doi:10.1001/jama.2014.6342