What does it measure?
Gut bacteria turn some bilirubin into urobilinogen. Most is handled through the bowel and liver; a small amount returns to the blood and leaves through urine. Unlike urine bilirubin, a small amount of urobilinogen can be expected.
Before the test
- Sample
- Collect urine in the laboratory’s container, following its clean-catch instructions.
- Preparation
- This test alone usually needs no special preparation. Instructions for other tests may differ.
What can the result mean?
Higher amounts may occur when red blood cells break down more quickly or the liver handles this pigment differently. Very low or absent amounts may occur when bile cannot reach the gut. Neither pattern establishes a diagnosis by itself. [1]
When is it useful, and how is it read?
Read an unusual result during an assessment of liver disease, bile-flow problems, or red-cell breakdown. Urine bilirubin, blood bilirubin fractions, and the blood count help distinguish these possibilities; the urine value alone cannot. [1]
What can affect it?
Antibiotics can reduce the gut bacteria involved in making urobilinogen. Urine acidity, sample freshness, and some medicines affect interpretation. The lab’s method and reference interval are more useful than an isolated number found online. [1]
A small amount can be expected
Urobilinogen is different from bilirubin on a urine strip. Small amounts can normally reach urine after gut bacteria process bile pigments. [1]
Questions you might have
Is any urobilinogen in urine abnormal?
No. A small amount can be normal because it is part of bilirubin processing. [1]
Can this result identify a liver disease on its own?
No. Liver tests and sometimes blood-cell tests help distinguish the possible explanations. [1]
What comes next?
Read the result with urine bilirubin, blood bilirubin, liver enzymes, and the blood count if indicated. A clinician can decide whether it needs repeating or a more targeted check based on symptoms. [1]
Does this pattern point toward liver or bile-flow changes, or do we need to check red-cell breakdown?
The reference interval and units on your report are part of understanding your result. Understand units, reference intervals, and treatment targets.
Sources & references
Medical references & original research
Books we consulted
References that informed our explanations of the test and its context.
- Pagana KD, Pagana TJ, Pagana TN. Mosby’s Diagnostic and Laboratory Test Reference. 14th ed. Elsevier; 2019.
Practical-section sources accessed: .
For general health education. Interpreting your result and deciding on tests or treatment requires your health context and a qualified clinician.
