Nadirs of Oral Glucose Tolerance Tests Are Independent of Age and Sex

We analyzed nadirs of 75-g oral glucose tolerance tests in 400 subjects who remained completely asymptomatic during the test. The median nadir was 63 mg/dl, the 10th percentile 48 mg/dl, and the 2.5th percentile 41 mg/dl. Seventy-five percent of the nadirs occurred at 3–4 h. There were no differences in the absolute level of nadirs between men and women, nor between the subjects 17–30 and 61–74 yr of age.