2-hour Postprandial Glucose

What is it?

A 2-hour postprandial glucose, sometimes called 2-hour PPG, is a blood test. Postprandial means "after a meal." Glucose is the simplest form of sugar and is the main source of energy in your body. Your caregiver will tell you what you should eat for the meal. You may be asked to drink a special glucose liquid instead of eating a meal. A blood sample, to be tested for glucose, is taken 2-hours after the meal or drink is finished.

Why do I need it?

You may need this test to learn if you have diabetes mellitus. Sometimes a fasting blood sugar (FBS) will be done before the 2 hr PPG. The results of these tests can tell if you have diabetes mellitus or need further testing. For more information, ask your caregiver for the CareNotes™ handout about Diabetes Mellitus. The following symptoms are reasons your caregiver may want you to have this test.

  • Blurred vision.

  • Excessive hunger.

  • Excessive thirst.

  • Excessive urination.

  • Unexplained weight loss.

How do I get ready for the test?

  • Your caregiver will tell you if you need to have a special diet before the day of the test.

  • Caregivers will give you instructions for the FBS if they are going to do it before the 2-hour PPG.

  • For the 2-hour PPG, tell your caregiver if you cannot finish the meal or drink, or if you vomit (throw up).

  • You should rest during the 2 hours between the meal or drink and the blood collection.

  • Do not smoke, eat, drink, or exercise during the 2 hours. These activities cause the blood sugar levels to be falsely low or falsely high.

How is the blood collection done?

A caregiver will put a wide rubber strap around your arm and tighten it. Your skin will be cleaned with alcohol. A small needle attached to a special test tube will be put into a vein in your arm or hand. The tube has suction to pull the blood into it. When the tube is full, the rubber strap, needle and tube are removed. The caregiver will press a piece of cotton where the needle was removed. You may be asked to hold the cotton on the site for a few minutes to help stop the bleeding. Tape may then be put over the cotton on your arm.

What do I do after the test?

You may remove the tape and cotton in about 20 to 30 minutes. Call your caregiver to get the results your test. Your caregiver will explain what your test results mean for you. Follow the instructions of your caregiver.

Care Agreement

You have the right to help plan your care. To help with this plan, you must learn about your lab tests. You can then discuss the results with your caregivers. Work with them to decide what care may be used to treat you. You always have the right to refuse treatment. The above information is an educational aid only. It is not intended as medical advice for individual conditions or treatments. Talk to your doctor, nurse or pharmacist before following any medical regimen to see if it is safe and effective for you.

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