Guidelines of patient preparation for blood for oral glucose tolerance test

  1. Over the course of three days, the patient shall take good care of their diet. Food with high carbohydrate levels and heavy physical activities shall be avoided. If necessary, the consulting physician may suspend some or all the pharmaceuticals.
  2. Treatment procedures are not recommended during this period.
  3. Standard blood sampling is performed in the morning, on an empty stomach (no less than 8 to 12 hours after last meal). Do not drink or brush teeth before the test.
  4. Do not smoke before and during the test. TEST PROCEDURE:
    • Glucose challenge test is performed on patients having the initial (fasting) glucose level of no higher than 6.9 mmol/l (this does not apply to pregnant women).
    • A blood sample is drawn from a finger or a vein for the test. After sampling, the patient is administered 75 g of powdered glucose (for children, glucose quantity shall be calculated based on their body weight, however, it shall not exceed 75 g) diluted in a glass of clean water. Glucose powder may be purchaced at a pharmacy.
    • The patient shall stay in a relaxed atmosphere during the following two hours, it is preferable that they sit or lie. Do not walk or perform any activities that require an expenditure of calories otherwise the results of the test may be inaccurate. After the period has elapsed, blood is sampled one more time.
    • For pregnant women, blood is sampled three times: first time on an empty stomach, and one and two hours following the administration of 75 g of glucose.