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What is the criteria to confirm the diagnosis of diabetes?

Q: Both my parents are diabetic and hypertensive. Last year I got my glycosylated haemoglobin (Hb) checked, which was found to be 6.8. A week back it was showing 8.4. I have stopped taking any kind of sugar and also keeping a strict control on my diet. The fasting blood sugar is 89 mg/dl and 75 gm glucose load 2 hours PPBS is 129 mg/dl. Am I a diabetic? What other tests do I need to confirm or rule out diabetes mellitus?

A:As per your oral glucose tolerance test (OGTT) you are not diabetic may be there is problem in A1C assay. For diagnosis of diabetes mellitus (DM), A1C alone is not a criteria. The American Diabetic Association (ADA) diagnostic criteria for DM is as follows: 1. Fasting blood glucose (FBG) >125 mg/dl on two separate occasions. 2. 2 hour post 75 gm glucose >200 mg/dl. 3. Osmotic symptoms plus a RBG of > 200 mg/dl. The tests of blood glucose should be in lab not with glucometer. In your case I presume that there is problem in the A1C test. Get it repeated from a more reliable lab.

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