We present the case of a 61-year-old black woman with a diagnosis of type 2
diabetes and a falsely elevated hemoglobin A(1c) (HbA(1c)) due to heredita
ry persistence of fetal hemoglobin. Physicians and allied health care profe
ssionals are alerted to this potentially significant problem in the diagnos
is and management of diabetes mellitus (DM), particularly in the wake of th
e Diabetes Complications and Control Trial when "strict" glycemic control a
ssessed by HbA(1c) is now the standard of care.