URINE SUGAR, FASTING

Urine Sugar, Fasting

What it is

The Urine Sugar, Fasting test measures the presence of glucose (sugar) in the urine after a period of fasting, usually overnight. Normally, glucose is not detected in urine because the kidneys reabsorb it into the bloodstream. When glucose levels in the blood are excessively high, some may spill into the urine. This test helps in screening and monitoring conditions related to abnormal blood sugar regulation.

Uses

This test is commonly used as a simple screening tool for diabetes mellitus, impaired glucose tolerance, or other metabolic disorders. It may also be ordered to monitor the effectiveness of diabetes treatment, evaluate unexplained symptoms such as excessive urination or thirst, and detect renal glycosuria (a rare condition where glucose leaks into urine despite normal blood glucose levels).

Symptoms That May Lead to the Test

Doctors may recommend this test if you experience symptoms such as frequent urination, excessive thirst, unexplained weight loss, fatigue, blurred vision, or slow wound healing. It may also be ordered during routine health checks or diabetes risk screening.

Abnormal Results

Positive for Sugar in Urine (Glycosuria): Suggests elevated blood glucose levels, commonly due to diabetes mellitus. It can also occur in pregnancy (gestational diabetes) or in kidney disorders that impair glucose reabsorption.

Negative for Sugar in Urine: Normal finding, indicating that blood glucose is within a healthy range or below the renal threshold for glucose excretion.

Risks

The test is completely non-invasive, requiring only a urine sample. There are no physical risks, though proper sample collection and fasting are important for accurate results.