Conjugated Bilirubin Level (Serum)
This test measures the amount of conjugated bilirubin in your blood. Conjugated bilirubin is a form of bilirubin that has been processed by your liver and is ready to be excreted in bile.
["Conjugated bilirubin helps assess liver function and bile flow."]
Key facts at a glance
- LOINC
- 55271-1
- Short code
- S pneum conjugated immunization status
- Synonyms
- S pneum conjugated immunization status
- Category
- coagulation
- Sample
- serum
- Container
- Red-top tube (SST)
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Specimen volume
- 5 mL
- Stability
- Room temperature: 4h, Refrigerated: 24h, Frozen: 7d
- Hemolysis max
- 500
- Lipemia max
- 1000
- Icterus max
- 500
- TAT
- 4–24 hours
- Order
- routine
What Does This Test Measure?
Conjugated bilirubin is a water-soluble form of bilirubin produced when your liver breaks down old red blood cells. It is transported through the bile ducts into the intestines, where it helps with digestion. Elevated levels may indicate issues with liver function, bile duct blockage, or other liver-related conditions.
Why Might You Need This Test?
Your healthcare provider may order this test if you have symptoms like jaundice (yellowing of the skin or eyes), unexplained fatigue, abdominal pain, or if they suspect liver disease, bile duct problems, or other conditions affecting bilirubin metabolism.
What to Expect Before the Test
No special preparation is typically required. You may be asked to fast for 8–12 hours before the test if it is part of a broader liver function panel. Bring any medications or supplements you are currently taking to your appointment.
During the Test
A healthcare professional will draw blood from a vein in your arm using a small needle. The process is quick and usually causes only minor discomfort. The blood sample will be sent to a lab for analysis.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Elevated conjugated bilirubin levels can signal conditions such as liver disease (e.g., hepatitis, cirrhosis), bile duct obstructions, or certain genetic disorders. Low levels may indicate normal processing of bilirubin or conditions affecting its production (e.g., hemolytic anemia). Always discuss results with your provider for personalized interpretation.
Short name
Bilirubin (Conjugated)
Frequently asked questions
What Are Normal Results?
How Often Should I Get This Test?
Can Diet or Medications Affect This Test?
Sources
- 1
- 2Lab Tests OnlineSource
- 3
Click any link to access the full source. PubMed Central (PMC) links provide free full-text access.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
If you think you may have a medical emergency, call your local emergency number or go to the nearest emergency department immediately.
Medically reviewed by WellAlly Editorial Team Last reviewed August 16, 2026. · Read our editorial policy