Not necessarily. The A1C is not an average of blood sugar readings. It's the percentage of red corpuscles which are glycosylated. The HbA1c makes it impossible for spikes and hypoglycemic episodes to fool the doctor (highs and lows may average out to a decent reading yet be doing considerable damage). My last HbA1C was 4.5% and at the time my two week average sugar was 93 mg/dl. I took it three times per day: early morning fasting, two hour postprandial after lunch and two hours after dinner.

It's an excellent measure of the tightness of control in addition to the degree of control.