The Urine For Sugar test is a simple, non-invasive screening tool. It checks for the presence of glucose (sugar) in your urine. Healthy kidneys reabsorb glucose, so there should be none in your urine. The presence of glucose (glycosuria) is a strong indicator that your blood sugar levels are high enough to "spill" over, a hallmark of diabetes. This simple urine sample provides a clear, qualitative sign, prompting the need for a more definitive blood test to confirm a diagnosis.