What Are Considered Normal Results For a Glucose Tolerance Test?

The oral glucose tolerance test is a glucose load test used to understand islet -cell function and the body's ability to regulate blood glucose. It is a confirmatory test for diagnosing diabetes and is widely used in clinical practice. For patients in the acute phase of other diseases, it may be It needs to be repeated to confirm the diagnosis of diabetes. The oral glucose tolerance test refers to the oral administration of 75g of anhydrous glucose to children. The total amount of children is 1.75g per kilogram of body weight, the total amount does not exceed 75g, and then the blood glucose changes are measured to observe the patient's ability to tolerate glucose. It is currently recognized as a diagnosis of diabetes. The gold standard is used to determine if diabetes is abnormal when blood glucose is abnormally high but has not yet reached the diagnostic criteria for diabetes.

Basic Information

Chinese name

Oral glucose tolerance test

Foreign name

ogtt

Purpose

Measuring islet cell function

Category

Glucose load test

Features

Diagnose diabetes

Clinical significance of oral glucose tolerance test

Normal sugar tolerance

FBG6.1mmol / L, OGTT 2-hour blood glucose <7.8mmol / L.

2. Impaired fasting blood glucose (IFG)

FBG6.1 6.9mmol / L, OGTT 2-hour blood glucose <7.8mmol / L.

3. Impaired glucose tolerance (IGT)

FBG <7.0mmol / L, abnormal glucose tolerance (IGT) is found in: excessive stages between glucose metabolism and diabetes (or pre-diabetes); severe liver disease; others: hyperthyroidism, pancreatitis, pancreatic cancer, etc. .

4. Increased sugar tolerance

More common in low endocrine function, such as hypothyroidism, hypopituitarism and so on.

Reference range of oral glucose tolerance test

Fasting blood glucose is 3.9 to 6.1 mmol / L. Blood glucose peaks at 0.5 to 1 hour after oral glucose, with a peak value of <8.99 mmol / L, blood glucose <7.8 mmol / L within 2 hours, and blood glucose returns to normal after 3 hours.

Precautions for oral glucose tolerance test

1. During the trial, patients should avoid strenuous exercise, physical labor, rest quietly, cannot smoke, fast, and water.

2. For patients suspected of reactive hypoglycemia, extend the test time and add blood glucose 4 hours and 5 hours after taking glucose.

3. Observe the patient's response after taking sugar. If the patient appears pale, nausea, and syncope during the test, the test should be stopped. If the above symptoms appear 3 to 4 hours after taking sugar, hypoglycemic reactions should be considered, blood should be collected immediately to check blood sugar, and patients should be instructed to eat food such as porridge and steamed buns, and closely observe changes in the condition.

4. Immediately after taking blood sugar.