Many reasons: A1c could be falsely low if you're anemic or have a blood disorder. Your fasting sugar could be wrong if your meter is old or not registering right. You need blood testings to diagnose diabetes, not glucometer measurements. If a1c or fasting sugar values are conflicting, ask your doctor for an oral glucose tolerance test. This is another way to diagnose diabetes.
Answered 3/20/2014
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