Bilirubin (Total & Direct)
Bilirubin is a yellow-orange pigment produced when red blood cells break down. The liver processes it and excretes it in bile. High bilirubin causes jaundice (yellow skin and eyes). Distinguishing direct (conjugated) from indirect (unconjugated) bilirubin tells your doctor whether the problem is before, in, or after the liver.
Normal Range
Total: 0.1–1.2 mg/dL; Direct: 0.0–0.3 mg/dL
Reference ranges may vary slightly between laboratories. Always interpret your result in context with your doctor.
Why is Bilirubin measured?
Bilirubin is tested to evaluate jaundice, liver function, gallbladder and bile-duct disease, and conditions causing red blood cell destruction (haemolysis). It is part of the standard liver panel.
High Bilirubin means…
High total bilirubin causes jaundice. Predominantly indirect bilirubin (>80% of total) suggests haemolysis or Gilbert's syndrome (a benign genetic variant). Predominantly direct bilirubin suggests liver disease or bile-duct obstruction.
Low Bilirubin means…
Low bilirubin is not clinically significant.
Symptoms associated with abnormal Bilirubin
When Bilirubin is high:
- Yellow skin or eyes (jaundice)
- Dark urine
- Pale stools
- Itching
- Fatigue
- Right upper abdominal pain
When Bilirubin is low:
- Asymptomatic
How to improve your Bilirubin
- Mild isolated indirect bilirubin elevation is often Gilbert's syndrome and needs no treatment.
- Persistent direct bilirubin elevation requires investigation — usually liver imaging and additional liver tests.
- Sudden jaundice with right-upper-abdomen pain may indicate gallstone obstruction — seek urgent evaluation.
Frequently asked questions about Bilirubin
What is Gilbert's syndrome?
Gilbert's syndrome is a common, harmless genetic variant affecting 5–10% of people. It causes mildly elevated indirect bilirubin, especially during fasting, illness, or stress. It does not require treatment.
When is jaundice an emergency?
Jaundice with severe abdominal pain, fever, confusion, or rapid onset is a medical emergency and needs immediate evaluation. Causes can include acute hepatitis, gallstone obstruction with infection, or acute liver failure.
Medical Sources
This page is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider about your individual results.