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What do the results of the oral glucose tolerance test mean?

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Your blood glucose level should rise and then fall after you finish the sugary drink. Two hours after you finish the glucose drink, this is what your results mean:

• Below 140 mg/dL: normal blood sugar
• Between 140 and 199: impaired glucose tolerance, or prediabetes
• 200 or higher: diabetes

If you're pregnant, a blood glucose level of 140 mg/dL or higher is abnormal. Your doctor will recommend that you take a three-hour oral glucose tolerance test. You'll have blood drawn before you drink a sugary solution. Then you'll have your blood tested every hour for three hours.

SOURCES:
 

American Academy of Family Physicians: "Diabetes."

American Association for Clinical Chemistry: "Glucose Tests."

American Diabetes Association: "Diagnosing Diabetes and Learning About Prediabetes," "How to Treat Gestational Diabetes."

CDC: "Oral Glucose Tolerance Test (OGTT) Procedures Manual."

Cleveland Clinic: "Oral glucose tolerance test during pregnancy."

Dartmouth-Hitchcock: "Oral Glucose Tolerance Test."

National Institute of Diabetes and Digestive and Kidney Diseases: "Step 1: Learn About Diabetes."

PubMed Health: "Glucose tolerance tests: What exactly do they involve?"

St. Joseph-Mercy Hospital: "Preparing for the Oral Glucose Tolerance Test (Adults)."

Mayo Clinic, “Glucose tolerance test,” “Triglycerides, why do they matter?” Polycystic ovary syndrome (PCOS).

Johns Hopkins Medicine, “What is the pancreas?”

Reviewed by Michael Dansinger on November 6, 2020

SOURCES:
 

American Academy of Family Physicians: "Diabetes."

American Association for Clinical Chemistry: "Glucose Tests."

American Diabetes Association: "Diagnosing Diabetes and Learning About Prediabetes," "How to Treat Gestational Diabetes."

CDC: "Oral Glucose Tolerance Test (OGTT) Procedures Manual."

Cleveland Clinic: "Oral glucose tolerance test during pregnancy."

Dartmouth-Hitchcock: "Oral Glucose Tolerance Test."

National Institute of Diabetes and Digestive and Kidney Diseases: "Step 1: Learn About Diabetes."

PubMed Health: "Glucose tolerance tests: What exactly do they involve?"

St. Joseph-Mercy Hospital: "Preparing for the Oral Glucose Tolerance Test (Adults)."

Mayo Clinic, “Glucose tolerance test,” “Triglycerides, why do they matter?” Polycystic ovary syndrome (PCOS).

Johns Hopkins Medicine, “What is the pancreas?”

Reviewed by Michael Dansinger on November 6, 2020

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How are random blood glucose tests or hemoglobin A1c screenings used in the diagnosis of diabetes?

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