I am pre-diabetic (fbg>110 a1c=6.0) i did gtt @home w 73g carbs. fbg=118, ppbg <140 (1/2hr self-tests). how can i have good ppbg & poor fbg/a1c? (my pp tests always <150, but bg never tests <100)

Prediabetes: Some prediabetic patients have impaired fasting blood sugar but not impaired glucose tolerance. Your pancreas secretes enough Insulin when you take in foods so that your postprandial blood sugars are not abnormally high. This may change in time but you can delay the impairment with good diet and weight control.

Averages: Th aic is made of averages, so if sugars are often above normal but not terrible it can still be high. And some women are more prone to elevated fasting or pp sugar levels. And you never know what happens the rest of he day when you are not checking.