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Prediabetes means blood sugar is above normal. Here’s what to know to prevent this from becoming full-blown diabetes. Prediabetes affects about 88 million American adults. That’s more than one out of three people. Of the people who have prediabetes, more than 84 percent don’t know they have it. Prediabetes means that someone’s blood sugar levels are higher than normal, but not high enough to be diagnosed as diabetes. Although usually a fasting blood glucose or A1C test (a blood test that measures average blood sugar level for several months) is used for diagnosis, a prediabetes diagnosis can come from bloodwork...