I think my A1c has probably always read lower than bg would suggest. When glycosylated hemoglobin tests first came out, I remember my doctor remarking that mine was sure lower than most of his patients (I seem to remember an 8, but don’t know how comparable those late 1970s numbers were to the current tests). At least 2 endos have remarked on it more recently. It’s been running mostly in 5s for years, low 5s since Tandem Control IQ, but Dexcom numbers would suggest about 6.

I’ve wondered if I’m just lucky, and the low glycosylation has contributed to my 67 years with T1, more than a third of that without even home blood testing.