Glucose tolerance test (fasting, 60 min., 120 min.)

The glucose tolerance test (GTT) is an important diagnostic tool in medical practice for detecting carbohydrate metabolism disorders, including diabetes. This test helps to assess how the body absorbs glucose after its consumption and the quality of the pancreas's response to insulin production. The GTT is performed on an empty stomach and at certain intervals after consuming glucose, usually after 60 and 120 minutes. Let's look at the procedure and the implications of the results of this test in more detail.

Before the GTT, the patient is advised not to eat or drink for 8-12 hours (usually overnight) to get an accurate reading of fasting glucose levels. The first step of the test is to measure fasting blood glucose. Next, the patient is given a glucose solution to drink (usually 75 grams of glucose dissolved in water) and the time is recorded. Blood glucose is measured again 60 and 120 minutes after consuming the glucose.

The data obtained allow the doctor to draw the following conclusions:

1. Normoglycemia: If glucose levels remain within normal limits throughout the test, this indicates normal glucose tolerance.
2. Impaired glucose tolerance: If glucose levels rise after consuming glucose but do not yet reach critical levels, this may indicate a prediabetic condition known as impaired glucose tolerance.
3. Diabetes mellitus: If glucose levels increase significantly and exceed a certain threshold after consuming glucose, this may indicate diabetes.

GTT can be an important tool for early diagnosis of diabetes, as well as for assessing the effectiveness of treatment in patients with diabetes. However, it is important to note that preparing for and performing GTT can be quite difficult for some patients due to the need to maintain a fasting state without food or drink.

Given this, GTT may not be an appropriate option for all patients, and the physician should always consider each patient's individual characteristics and circumstances before ordering this test. It is also important to note that GTT results should be evaluated in conjunction with other clinical and laboratory data to obtain a complete picture of the patient's health.

If you have any questions or concerns about GTT, it is important to consult a doctor for advice and to determine the optimal plan of action.