Conjugated Bilirubin, Fluid — Mass Concentration
Measures direct, or conjugated, bilirubin in a body-fluid sample to help assess bile pigment and liver-related abnormalities.
["This test measures conjugated bilirubin in the specified fluid and is interpreted alongside the overall clinical picture."]
Key facts at a glance
- LOINC
- 33458-1
- Short code
- Bilirub Conj Fld-mCnc
- Synonyms
- Bilirub Conj Fld-mCnc
- Category
- liver
- 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 is this test?
Conjugated bilirubin, also called direct bilirubin, is the form of bilirubin that has been processed by the liver. This test measures its amount in a body-fluid sample, such as fluid collected from another clinical site.
Why might I need this test?
A clinician may order this test when evaluating liver or bile-duct problems or when examining fluid that may be related to an abdominal or other illness. It may be used with other laboratory findings to help determine the cause of an abnormal result.
How is the test performed?
A laboratory analyzes the submitted fluid for conjugated bilirubin using a validated laboratory method. Results are reported as a mass concentration, and the same sample may also be tested for total bilirubin and other substances.
How do I prepare for the test?
Preparation depends on the type and source of the fluid being tested. Follow your clinician's instructions about fluid collection, fasting, and medications; special preparation is not required for every bilirubin test.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
An elevated conjugated bilirubin level may be associated with impaired bile flow, liver disease, or other conditions affecting bilirubin processing. The result must be interpreted with the total bilirubin level, the type of fluid, symptoms, and other laboratory findings because fluid bilirubin is not diagnostic by itself.
Short name
Conjugated Bilirubin, Fluid
Frequently asked questions
What is the difference between conjugated and total bilirubin?
Does this test use blood or body fluid?
Does an abnormal bilirubin result mean I have liver disease?
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