Insulin tolerance test

Insulin Tolerance Test (ITT) is a medical diagnostic procedure used to assess insulin resistance, hypoglycemia, and pituitary function. The test involves the administration of insulin to induce hypoglycemia and then monitoring the body's response.

Procedure

The Insulin Tolerance Test begins with the patient fasting overnight. The next morning, a baseline blood sample is taken to measure levels of glucose and cortisol. Insulin is then administered intravenously, and blood samples are taken at regular intervals to measure the body's response. The test is considered positive if the blood glucose level falls below a certain threshold and the cortisol level rises.

Uses

The primary use of the Insulin Tolerance Test is in the diagnosis of insulin resistance, a condition in which the body's cells do not respond properly to insulin. This can lead to Type 2 diabetes. The test can also be used to diagnose hypoglycemia, a condition characterized by low blood sugar levels. In addition, the ITT can be used to assess pituitary function, as the body's response to hypoglycemia is mediated by the pituitary gland.

Risks and Complications

The Insulin Tolerance Test is generally safe, but it can cause side effects such as sweating, trembling, hunger, and in severe cases, loss of consciousness. The test should be performed under medical supervision to manage these potential complications.

Alternatives

While the Insulin Tolerance Test is a valuable diagnostic tool, there are alternatives available. These include the Oral Glucose Tolerance Test (OGTT) and the HOMA-IR (Homeostatic Model Assessment for Insulin Resistance) test.

See Also

• Glucose Tolerance Test
• Insulin Resistance
• Hypoglycemia
• Pituitary Gland