According to the National Institute of Diabetes and Digestive
and Kidney Diseases: - People over age 45 should be tested for
prediabetes or diabetes. If the first blood glucose test is
normal, they should be re-tested every three years. - People
under age 45 should consider getting tested for prediabetes or
diabetes if they have a body mass index (BMI) of greater than or
equal to 25 kgm/m2 and have one or more of the following risk
factors: - Having a first-degree relative with diabetes (mother,
father, or sibling) - Being a member of a high-risk ethnic group
(African-American, Hispanic, Asian, Pacific Islander, or Native
American) - Delivering a baby weighing more than 9 pounds, or
having diabetes during pregnancy - Having blood pressure at or
above 140/90 mm/Hg - Having abnormal blood fat levels, such as
high-density lipoproteins (HDL) less than or equal to 35 mg/dL,
or triglycerides greater than or equal to 250 mg/dL (mg/dL =
milligrams of glucose per deciliter of blood) - Having a
sedentary lifestyle - Ha