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Oral Glucose Tolerance Test - Results
About this test
The oral glucose tolerance test (OGTT) measures the body's ability to use a type of sugar, called glucose, that is the body's main source of energy.
Normal
The normal values listed here—called a reference range—are just a guide. These ranges vary from lab to lab, and your lab may have a different range for what’s normal. Your lab report should contain the range your lab uses. Also, your doctor will evaluate your results based on your health and other factors. This means that a value that falls outside the normal values listed here may still be normal for you or your lab.
But with screening for gestational diabetes, the American Diabetes Association has recommended specific glucose values be used for diagnosis. If any of your glucose values are higher than what is listed in the table, you will be diagnosed with gestational diabetes.1
| 75 g of glucose | Fasting: | Less than 95 mg/dL or 5.3 mmol/L |
|---|---|---|
| 1-hour: | Less than 180 mg/dL or 10.0 mmol/L | |
| 2-hour: | Less than 153 mg/dL or 8.5 mmol/L |
| 75 g of glucose | 2-hour: | Less than 140 mg/dL or 7.8 mmol/L |
|---|
High values
High glucose levels may be caused by:
- Gestational diabetes.
- Polycystic ovary syndrome (PCOS).
- Taking medicines, such as corticosteroids, niacin, phenytoin (Dilantin), some diuretics, and some medicines used to treat high blood pressure, HIV, or AIDS.
- Severe stress.
- Large amounts of the hormone cortisol in the blood (Cushing's syndrome).
- Inherited diseases, such as cystic fibrosis or hemochromatosis.
- Overproduction of growth hormone (acromegaly).
- Pheochromocytoma.
Low values
Low glucose levels may be caused by:
- Certain medicines, such as medicines used to treat diabetes, some blood pressure medicines (such as propranolol), and some medicines for depression (such as isocarboxazid).
- A condition that prevents the intestines from absorbing nutrients from food, such as celiac disease.
- Decreased production of the hormones cortisol and aldosterone (Addison's disease).
- Problems with the thyroid gland (hypothyroidism) or an underactive pituitary gland.
- A tumor of the pancreas (insulinoma).
- Inflammation and scarring of the liver (cirrhosis).
Many conditions can change blood glucose levels. Your doctor will discuss any significant abnormal results with you in relation to your symptoms and past health.
| By: | Healthwise Staff | Last Revised: October 19, 2010 |
| Medical Review: | Caroline S. Rhoads, MD - Internal Medicine David C.W. Lau, MD, PhD, FRCPC - Endocrinology | |
© 1995-2011 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated. This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. How this information was developed to help you make better health decisions.
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