If your level is higher than 140 mg/dL, you’ll need to take a glucose tolerance test. You’ll drink a liquid that contains glucose, and then 1 hour later your blood will be drawn to check your blood sugar level. This measures your blood sugar at the time you’re tested. Blood sugar that’s higher than normal early in your pregnancy may indicate you have type 1 or type 2 diabetes rather than gestational diabetes. If your risk is higher for getting gestational diabetes (due to having more risk factors), your doctor may test you earlier. You’ll probably be tested between 24 and 28 weeks of pregnancy. Gestational diabetes is diagnosed using blood tests. You may have your urine tested for ketones (produced when your body burns fat for energy), which also indicate type 1 diabetes instead of type 2 diabetes. If your doctor thinks you have type 1 diabetes, your blood may also tested for autoantibodies (substances that indicate your body is attacking itself) that are often present in type 1 diabetes but not in type 2 diabetes. Ask your health care provider what your results mean if you’re being tested for gestational diabetes. *Results for gestational diabetes can differ. A blood sugar level of 200 mg/dL or higher indicates you have diabetes. You can take this test at any time and don’t need to fast (not eat) first.

At 2 hours, a blood sugar level of 140 mg/dL or lower is considered normal, 140 to 199 mg/dL indicates you have prediabetes, and 200 mg/dL or higher indicates you have diabetes. Then you’ll drink the liquid and have your blood sugar level checked 1 hour, 2 hours, and possibly 3 hours afterward. You’ll fast (not eat) overnight before the test and have your blood drawn to determine your fasting blood sugar level. This measures your blood sugar before and after you drink a liquid that contains glucose. A fasting blood sugar level of 99 mg/dL or lower is normal, 100 to 125 mg/dL indicates you have prediabetes, and 126 mg/dL or higher indicates you have diabetes. This measures your blood sugar after an overnight fast (not eating). An A1C below 5.7% is normal, between 5.7 and 6.4% indicates you have prediabetes, and 6.5% or higher indicates you have diabetes. The A1C test measures your average blood sugar level over the past 2 or 3 months. Your doctor will have you take one or more of the following blood tests to confirm the diagnosis: A1C Test Tests for Type 1 Diabetes, Type 2 Diabetes, and Prediabetes Testing is simple, and results are usually available quickly. You’ll need to get your blood sugar tested to find out for sure if you have prediabetes or type 1, type 2, or gestational diabetes.

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