Urine For Sugar

Function

The 'Urine for Sugar' test, commonly referred to as a glucose urine test, measures the amount of glucose present in a urine sample. Under normal physiological conditions, the kidneys reabsorb almost all glucose from the filtrate back into the bloodstream. Glucosuria (sugar in the urine) occurs only when the blood glucose levels exceed the 'renal threshold'—typically around 180 mg/dL—at which point the kidneys can no longer reabsorb the excess, and it spills into the urine.

Why it is Ordered

This test is used as a quick, non-invasive screening tool for Diabetes Mellitus. It is often part of a routine urinalysis. While blood glucose testing is more accurate for monitoring diabetes, urine sugar remains relevant for screening in resource-limited settings, identifying 'Renal Glucosuria' (where the threshold is lower than normal), and monitoring patients taking SGLT2 inhibitors (a class of diabetes medication that intentionally causes glucosuria to lower blood sugar).

Associated Conditions

• Diabetes Mellitus: High blood sugar leading to spillover.
• Gestational Diabetes: Occurring during pregnancy.
• Fanconi Syndrome: A disorder of kidney tubule function.
• Cushing's Syndrome: Excess cortisol causing secondary hyperglycemia.