Can a hemoglobin A1c test tell if I have pre-diabetes?

Yes. Hemoglobin a1c 5.7 to 6.4 considered pre-dibetes by amer. Diabetes assoc.
Yes. As of 2010, we can use A1c to diagnose diabetes or pre-diabetes. 2 positive tests are still needed but A1c of 5.7-6.4% is considered pre-diabetes, A1c of 6.5% or above is diabetes. 5.6% or less is normal.