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Bilirubin, Mass Concentration

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

A bilirubin test measures the amount of bilirubin, a yellow pigment made during the breakdown of red blood cells, in a blood sample.

Quick summary

["This test helps evaluate how the body breaks down red blood cells and processes bilirubin."]

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

Key facts at a glance

LOINC
1978-6
Short code
Bilirub Ur-mCnc
Synonyms
Bilirub Ur-mCnc
Category
liver
Sample
urine
Container
Sterile urine container
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Specimen volume
10 mL
Stability
Room temperature: 2h, Refrigerated: 24h, Frozen: 7d
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

What is this test?

Bilirubin is a yellow pigment produced when red blood cells are broken down. This test measures the amount of bilirubin in a blood sample.

Why might I need this test?

This test may be ordered to investigate jaundice, unexplained changes in skin or eye color, or possible liver problems. It may also be used to monitor conditions that affect red blood cell breakdown or bilirubin processing.

How is the test performed?

A blood sample is collected and analyzed in a laboratory to determine the bilirubin concentration. Your healthcare professional will review the result along with your symptoms and other laboratory tests.

How do I prepare for the test?

No special preparation is usually needed for a routine bilirubin test. Follow any instructions provided by your healthcare professional, particularly if the test is part of a larger panel or if you are pregnant.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Bilirubin Test

Frequently asked questions

What does a bilirubin test measure?
It measures bilirubin in the blood. Bilirubin is a yellow pigment formed during the normal breakdown of red blood cells.
Why can bilirubin levels become elevated?
Levels can rise when red blood cells break down faster than usual or when the liver and bile system do not process or excrete bilirubin normally. Other conditions and certain medicines can also affect the result.
Does an abnormal bilirubin result always mean there is a liver problem?
No. An abnormal result can have several causes, including increased red blood cell breakdown, so it should be interpreted together with your symptoms, medical history, and other laboratory results.
  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