although studies show low vitamin d is linked to poor diabetes control it wouldn't necessarily give you a false reading. a hemoglobin a1c higher than 6. 5% indicates diabetes. the fact that your fasting blood glucose was normal is probably why your doctor is having you re-take your hemoglobin a1c. hopefully the second test will give you some clarity. the a1c is the average of your readings for 6 months. a 9. 1 reading puts your average reading at around 170. average not exact. that is diabetic. mornings without eating should average 80 - 130. two hours after eating should be under 180. if the 170 is a fasting reading you have diabetes. my opinion and what i was told in classes. not all methods for measuring hba1c are totally specific -one of the usual substances incriminated is hb f or foetal haemoglobin which only should usually be present in small amounts in adult blood however some people do carry larger amounts which can interfere with the assay.
my hgba1c is 9. 1 and my fasting blood sugar is 92. is this idicative of diabetes? . my vitamin d is also low. my doctor has prescribed a prescription for that and he wants to repeat the hgba1c. i'm not sure if that can alter the test or not.