How can I find out what my average blood glucose is?

Ask your health care provider to do an A1C test. This blood test shows the average amount of glucose in your blood during the past 2 to 3 months. Have this test done at least twice a year. If your A1C result is not as good as it should be, your health care provider will do this test more often to see if it is improving as your treatment changes. Your A1C result plus your blood glucose meter results can show whether your blood glucose is under control.

Aim for a result below 7 percent. If your A1C test result is below 7 percent, then your blood glucose is in a desirable range and your diabetes treatment plan is working. The lower your A1C is, the lower your chance of getting eye, nerve, and kidney damage.

If your test result is more than 8 percent, you need a change in your diabetes plan. Your health care team can help you decide what part of your plan to change. You may need to change your meal plan, your diabetes medicines, or your exercise plan.

source: http://diabetes.niddk.nih.gov/dm/pubs/complications_control/index.htm