The Glucose Post Prandial (GPP) test is a crucial measure of how your body handles sugar after you eat a normal meal. It measures your blood glucose level exactly 2 hours after you finish eating. This is a vital test for diagnosing and managing diabetes, as it shows how well your body's insulin is working to clear glucose from your blood. A simple blood draw is required. This test is a real-world "stress test" for your metabolism, providing a clear picture of your body's response to food.