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Bilirubin, Direct, Fluid — Substance Concentration

Published: August 9, 2026Updated: August 16, 2026

Measures direct bilirubin in a body-fluid sample to help assess bilirubin processing and bile drainage.

Quick summary

["An elevated direct bilirubin level may suggest impaired bile drainage or liver injury, depending on the fluid tested and clinical context."]

Medically reviewed by WellAlly Editorial TeamLast reviewed August 16, 2026Editorial policy

Key facts at a glance

LOINC
39463-5
Short code
Bilirub Indirect Fld-sCnc
Synonyms
Bilirub Indirect Fld-sCnc
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?

This test measures direct bilirubin, a form of bilirubin that has been processed by the liver and is ready for excretion in bile. The result is reported as a substance concentration in the submitted body fluid.

Why might I need this test?

A clinician may order this test when evaluating liver function or possible problems with bile drainage. The reason for testing and the meaning of the result depend on the specific body fluid collected.

How is the test performed?

A laboratory analyzes the fluid sample using a validated method to determine its direct bilirubin concentration. The sample may be submitted from another healthcare setting, and the laboratory report identifies the exact specimen type and units.

How do I prepare for the test?

Preparation depends on the body fluid being tested. Follow the collection instructions provided by your clinician or laboratory, and tell the healthcare team about medicines, recent procedures, pregnancy, or other relevant medical conditions.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Direct Bilirubin, Fluid

Frequently asked questions

What is the difference between direct and total bilirubin?
Direct bilirubin is the portion that has been processed by the liver for excretion in bile. Total bilirubin includes both direct and indirect bilirubin.
Does this result diagnose a liver or gallbladder condition?
No. An abnormal direct bilirubin result is not diagnostic by itself and must be considered with the type of fluid tested, other laboratory findings, symptoms, and your medical history.
Which body fluid is used for this test?
The slug identifies the specimen only as fluid, so the exact fluid type is not clear from the abbreviation alone. Check the specimen name printed on your laboratory report for the specific sample used.
  1. 1
    MedlinePlus — Laboratory TestsSource
  2. 2
    Lab Tests OnlineSource
  3. 3
    Mayo Clinic — Tests & ProceduresSource

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.

Medical Disclaimer

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