I wasn't fasting (I had just eaten before the test), and a previous 5 hour glucose tolerance test back in 1990 showed that I had reactive HYPOglycemia (huge drop in blood sugar
within one 1/2 hour). I've always had problems with LOW blood sugar
Btw, my vitamin D levels were also low: 28 ng/mL when they should be 32-100 ng/mL, and I read somewhere that hypothyroidism and vitamin D deficiency also go hand in hand.
The IgM's normal range is 40-230 mg/dL and I was 33, i.e., low.