Anyone who is overweight and 45 or older should be tested for prediabetes, advises the American Diabetes Association (ADA). If you're in that age category and of normal weight, ask your doctor if testing would be appropriate.

Younger overweight women also might need testing if they have: a family history of diabetes, high blood pressure, low high-density lipoprotein (HDL) cholesterol and high triglycerides, have been diagnosed with polycystic over syndrome (PCOS), had gestational diabetes or gave birth to a baby weighing more than nine pounds. Those in ethnic groups with high risk (black, Native American, Hispanic and Asian) should also talk with their healthcare providers.

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