(HealthDay News) -- Prediabetes is a condition characterized by abnormally high blood sugar levels that are not so high that diabetes may be diagnosed.

The American Diabetes Association says people age 45 or older who are overweight should be screened for prediabetes. If you are a healthy weight but in this age group, ask your doctor if you should get tested.

Others who may need a blood test for prediabetes include those younger than 45 with:

• High blood pressure.
• Low HDL ("good") cholesterol levels and high levels of triglycerides, or blood fats.
• A family history of diabetes or a personal history of gestational diabetes (diabetes in pregnancy).
• A baby that weighed more than 9 pounds at birth.
• Black, Hispanic or American Indian ancestry because these groups are at higher-than-average risk of diabetes. Pacific Islanders and Asian Americans are also at higher risk.