Gary's correct on the numbers. The HbA1C is the number to obtain and take note of as it's the historical "averaging" number and represents the percent of red blood cells that have been glycosated over the past 60-90 days.
Fasting Blood Glucose that is measured with a fingertip stick (or the blood draw if you're visiting your doctor) is an "instant read" and, while useful, can be manipulated or "gamed" as the current generation calls it. The A1C is the better "tell-tale"
If you wish to know your A1c, you can either schedule the blood draw with your doc, or you can purchase the Bayer "A1C Now" test to do at home. While this test is not official or acceptable by the FAA, it is close enough to the labratory reading to help monitor your situation.
It's often found online for $40 and includes two tests. But I've seen it in grocery store phamacies at $30.00
I use this kit periodically to measure my A1C and ensure I'm staying within my doctor's proscribed zone.
Now with all of the above said, the current CACI protocol (Conditions AME's Can Issue) permit the AME to issue the certificate as long as you have documented blood labs showing A1C at 6.5 or lower, a FBG at 126mg/dl or lower, are on diet/exercise control or stable on metformin, and your doctor says you are not at risk for the other big 4 items (neuro, renal, optho, cardio).
If you are higher than 6.5 and 126, then you will be put onto the Diabetes special issuance.
For anyone other than Tom reading this, and you're in the yellow arc with your blood sugars and/or high blood pressure, now is the time to take corrective action. Minor changes such as improved food choices and increasing the exercise will make a huge difference in your life, and keep you out of the "fun zone" of dealing with the Special Issuances.
EDIT: The attached chart might help some folks understand the correlation between their FBG and A1C numbers and the associated health risks.