This test measures glucose levels in the urine to screen for prediabetes and diabetes types 1 and 2. The test is performed after 2 hours from the start of the last food intake. ‘Postprandial’ means after having a meal. High levels of glucose in the body can be a sign of an underlying health condition. You can develop serious complications if your glucose levels remain high and if it is left untreated. Most commonly, elevated glucose levels indicate diabetes. It’s crucial to monitor glucose levels if you are diagnosed with diabetes or have prediabetes symptoms such as excessive thirst, blurred vision, and fatigue.