Glucose tolerance test - non-pregnant

The most common glucose tolerance test is the oral glucose tolerance test (OGTT). Before the test begins, when you have had nothing to eat or drink for at least 8 hours, a sample of blood will be taken. You will then be asked to drink a liquid containing a certain amount of glucose (usually 75 grams). Your blood will…

Make sure you eat normally for several days before the test. Do not eat or drink anything for at least 8 hours before the test. You cannot eat during the test. Ask your health care provider if any of the medicines you take can affect the test results.

Drinking the glucose solution is similar to drinking very sweet soda. Serious side effects from this test are very uncommon. With the blood test, some people feel nauseated, sweaty, lightheaded, or may even feel short of breath or faint after drinking the glucose. Tell your provider if you have a history of these…

Glucose is the sugar the body uses for energy. People with untreated diabetes have high blood glucose levels. Most often, the first tests used to diagnose diabetes in people who are not pregnant are: Fasting blood glucose level: diabetes is diagnosed if it is 126 mg/dL (7 mmol/L) or higher, on 2 different tests, done…

Normal blood values for a 75 gram OGTT used to check for type 2 diabetes in those who are not pregnant: Fasting -- 60 to 99 mg/dL (3.3 to 5.5 mmol/L) 1 hour -- Less than 200 mg/dL (11.1 mmol/L) 2 hours -- This value is used to make the diagnosis of diabetes. Less than 140 mg/dL (7.8 mmol/L) is normal From 140 mg/dL to…

A glucose level that is higher than normal may mean you have pre-diabetes or diabetes: A 2-hour value of 140 to 199 mg/dL (7.8 and 11.1 mmol/L) is called impaired glucose tolerance. Your provider may call this pre-diabetes. It means you are at increased risk of developing diabetes over time. Any glucose level of 200…

You may have some of the symptoms listed above under the heading titled "How the Test will Feel." There is little risk involved with having your blood taken. Veins and arteries vary in size from one person to another and from one side of the body to the other. Taking blood from some people may be more difficult than…

American Diabetes Association Professional Practice Committee. 2. Classification and diagnosis of diabetes: standards of care in diabetes-2024. Diabetes Care . 2024;47(Suppl 1):S20-S42. PMID: 38078589 pubmed.ncbi.nlm.nih.gov/38078589/ . Mojica A, Weinstock RS. Carbohydrates. In: McPherson RA, Pincus MR, eds. Henry's…