While many practitioners use the fasting blood sugar test results as a primary screen for diabetes mellitus, the postprandial blood sugar test (PPBS) is often used to confirm the diagnosis . Prior to the test the client fasts overnight and then consumes a meal that contains approximately 100 grams
of carbohydrates, or drinks a special 100-gram carbohydrate drink.
Two hours after eating, a venous blood sample is drawn and analyzed. The purpose of the PPBS test is to assess the body's response to the ingestion of carbohydrates in a meal.
Like the fasting blood sugar test, the postprandial blood sugar test measures the plasma level of glucose. The value of the postprandial test is its ability to identify diabetic conditions that may not be clearly revealed by the fasting blood sugar test.
Age 50 or less 70-140 mg/dl
Age 50-60 70-150 mg/dl
Age 60+ 70-160 mg/dl
Variations from Normal.
Diseases and conditions that affect the results of the fasting blood sugar test will also affect the postprandial blood sugar
test. Smoking during the test period can cause an increased glucose level.