Bile Pigments (Urinary Bilirubin)
- Sample Type
- Standard
- Fasting
- No
- Unit
- Qualitative
Bilirubin should not be detectable in the urine of a healthy individual. Because only conjugated bilirubin is water-soluble, its presence in urine always signifies an increase in serum conjugated bilirubin levels. This makes it a highly specific early indicator of liver disease or biliary obstruction, often appearing before clinical jaundice is visible.
Why Context Matters
False positives can be caused by drugs that color the urine (like Phenazopyridine). False negatives are common if the urine sample is left in light for too long, as bilirubin is photosensitive and degrades quickly. High doses of Vitamin C (ascorbic acid) can also interfere with the chemical reaction on the dipstick.
Lab ranges are statistical averages, not biological laws. "Normal" for a 20-year-old male isn't normal for a 60-year-old female.
Clinical References
Source-of-truth databases and clinical guidelines for Bile Pigments (Urinary Bilirubin):
Official Sources
- Bilirubin in Urine: MedlinePlus Medical TestMedlinePlus
Research & Guidelines
Related Indicators
Medically Reviewed by Dr. Binoy Babu, MBBS
Board Certified Doctor • 10+ Years Clinical Experience
Dr. Babu is a practicing physician dedicated to empowering patients with clear, actionable medical information. He founded 2opi to bridge the gap between complex lab reports and patient understanding, ensuring everyone has access to a reliable second opinion.
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