Amy, I'm concerned. I frankly know a great deal about diabetes, having had it for a long time, and having lost several friends and family members to the disease. I would suggest you research it again.
An A1C rating is 6 is very good, below the average. However, it isn't rated 4 - 6, its open-ended both high and low. A fasting glucose level of 150 would concern me very much, that's way to high. Tight control of glucose level would be a reading of no more than 100.