It is a known fact that very high or very low levels of glucose (blood sugar) are harmful to our bodies. Glucose is our bodys main source of energy, and the hormone insulin helps the bodys cells use glucose properly.Insulin imbalances also lead to glucose imbalances in the body. High levels of glucose (hyperglycemia) affect the bodys organs, and low levels of glucose (hypoglycemia) cause brain and nerve dysfunction. A postprandial urinary glucose test measures blood sugar levels after a meal or after a meal. A urine sample is taken 2 hours after a meal to test postprandial blood sugar levels. The kidneys filter blood to make urine. Urine usually contains little or no glucose. Diabetes, or high levels of glucose in the urine, is found when the glucose level is very high. The test results help monitor insulin therapy in people with diabetes.