Glucose, Postprandial

This is a blood test, which is done after a person has eaten. This helps determine how a person with diabetes responds to eating a meal and how high their blood sugars become during that time. This test is also done in pregnant women to help determine whether they will have a tendency toward diabetes during pregnancy. The test results may be elevated during stress even if the person does not have diabetes.


For the 2-hour PPG test, eat a high carbohydrate (breads, pasta, potatoes, starchy foods) meal. Then eat nothing else until blood work is done either one or two hours after the meal. There is no smoking or exercise permitted during testing or after eating.


2-hour PPG

  • 0-50 years: less than 140 mg/dl or less than 7.8 mmol/L (SI units)

  • 50-60 years: less than 150 mg/dl

  • 60 years and older: less than 160 mg/dl

1-hour glucose screen for Gestational (pregnancy term) diabetes: less than 140 mg/dl.

Ranges for normal findings may vary among different laboratories and hospitals. You should always check with your doctor after having lab work or other tests done to discuss the meaning of your test results and whether your values are considered within normal limits.


Your caregiver will go over the test results with you and discuss the importance and meaning of your results, as well as treatment options and the need for additional tests if necessary.


It is your responsibility to obtain your test results. Ask the lab or department performing the test when and how you will get your results.