Like "Your Dr SHOULD have the test done every 2 to 4 months. If s/he doesn't ask your Dr "isn't it time to do my A1c?" It is a blood test that is usually drawn by a lab. The results should be back within a couple of days at maximum. You could have your blood work done before a Dr visit so s/he can interpret it for you. There are home A1c test kits available. But I prefer lab tested A1c because they seem more reliable to me. every 3 to 4 months you should get an A1c done. Any more frequently is a waste of money, IMO."