A low or absent urobilinogen on the dipstick is most consistent with which scenario?

• A. Possible biliary obstruction or severe liver disease with reduced bilirubin turnover.
• B. Increased urobilinogen due to hemolysis
• C. Glucose present due to hyperglycemia
• D. Ketones indicating fasting

Answer: (A)

Urobilinogen in urine comes from bilirubin that has been processed in the gut. Bilirubin is conjugated in the liver and excreted into the intestine, where bacteria convert it to urobilinogen. Some of that urobilinogen is reabsorbed and finally excreted in urine. When bile flow is blocked or the liver isn’t processing bilirubin normally, less bilirubin reaches the gut, so less urobilinogen is formed and excreted. That results in a low or absent urobilinogen on the dipstick.

If there were hemolysis, more bilirubin would be produced and more urobilinogen would be formed, leading to increased urinary urobilinogen. Glucose in the urine or ketones reflect metabolic states (hyperglycemia or fasting/ketosis) and don’t explain a low urobilinogen, so they don’t fit the scenario as well.