What does a positive glucose on urine dipstick indicate?

• A. Glycosuria due to hyperglycemia or renal threshold issues.
• B. Ketone bodies from fat metabolism
• C. Increased bilirubin from liver disease
• D. Elevated urobilinogen levels

Answer: (A)

Glycosuria is what a positive urine glucose dipstick indicates. It means glucose is spilling into the urine, which happens most commonly when blood glucose is high (hyperglycemia) such that the filtered glucose load exceeds the kidney’s reabsorptive capacity in the proximal tubules. A second scenario is renal glycosuria, where the proximal tubule reabsorptive threshold for glucose is reduced, allowing glucose to appear in urine even if blood glucose isn’t dramatically elevated. This is why a positive dipstick for glucose points to possible hyperglycemia or a renal threshold/transport issue.

This finding is not due to ketone bodies, bilirubin, or urobilinogen, which are associated with different conditions (fat metabolism in ketosis, liver disease or biliary issues, and biliary or hemolytic processes, respectively).