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Oral Glucose Tolerance Test

2012-09-19 16:52

Oral Glucose Tolerance Test

The oral glucose tolerance test (OGTT) measures the ability to use a type of sugar, called glucose, the main energy source of human body. Patients with untreated Diabetes have high blood glucose. Glucose tolerance tests are one of the tools used to diagnose Diabetes.

When is the test needed?

The test is often done to rule out Gestational Diabetes in pregnant women. You will be at increased risk of developing gestational Diabetes if you:

Had history of gestational Diabetes

Have ever given birth to a baby weighing more than 4.1kg

Younger than 25 years old and overweight before pregnancy

In addition, the test is often done to diagnose pre-Diabetes and Diabetes.

How is the test performed?

Before the test begins, a sample of blood will be taken. You will be asked to drink a sweet liquid containing a measured amount of glucose (usually 75grams). Every 30 to 60 minutes after you drink the solution, blood sugar tests will be done.

Normal test values

Normal test results for 75 gram oral glucose test for to diagnose type 2 Diabetes on those who are not pregnant:

Fasting: 60-100mmol/l

1 hour postprandial blood glucose: less than 200 mg/dl

2 hour: no more than 140mg/dl

Note: the above are common measurement results of these tests. Normal value ranges may vary among different laboratories. You will need to talk with your doctors to know the meaning of your specific test result.

What does abnormal OGTT test result mean?

Higher than normal test results may indicate pre-diabetes, Diabetes or gestational Diabetes.

Results of 140 to 200mmol/l are referred to as impaired glucose tolerance, which will be used for diagnosis of pre-Diabetes. Those in this group are at increased risk of becoming Diabetes especially if overweight or unhealthy eating habits don’t improve.

Glucose level higher than 200mmol/l is an indicator for Diabetes.

In some conditions, however, high glucose levels maybe associated to another medical condition, such as Cushing Syndrome.

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