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Ogtt – Oral glucose tolerance test


It is a test for the detection of impaired glucose tolerance. The oral glucose tolerance test measures the body’s ability to use glucose. It is used to diagnose prediabetes and diabetes, most often during pregnancy (gestational diabetes). After fasting overnight, the patient is given a solution of glucose (syrup) in different concentrations (depending on the doctor’s request). First, the level of sober glycemia is determined, 1 hour after the load, and 2 hours after the load.

Venous or capillary blood.

Most laboratory blood tests require preparation, which means taking a sample (on an empty stomach) in the morning, 12 hours after the last feeding. This is necessary because food consumption in the period before blood sampling effects in increasing the concentration of glucose, cholesterol, lipids, proteins, iron, and other metabolites.

In order to obtain more accurate results, in agreement with the doctor, blood sampling should be done after stopping the therapy and washout period (which means the time required for all the drug to leave the body, and to achieve new basal values) This is especially recommended for iron therapy, vitamin preparations, hormonal therapy, etc.

Sober glycemic 3.3-5.6 mmol / L
Glycemia 1 hour after loading with 75g glucose <11.1 mmol / L
Glycemia 2 hours after loading with 75g glucose <5.6 mmol / L

Gestational diabetes – diabetes which occurs in pregnant women.