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Bilirubin, Direct — Serum/Plasma, Qualitative

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

A qualitative blood test that checks for direct-reacting bilirubin, a form of bilirubin associated with liver function and bile drainage.

Quick summary

["This test screens for direct-reacting bilirubin in blood to help evaluate liver function and bile flow."]

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

Key facts at a glance

LOINC
43820-0
Short code
Bilirub Direct SerPl Ql
Synonyms
Bilirub Direct SerPl Ql
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 checks your blood for direct-reacting bilirubin, a form of bilirubin that includes conjugated bilirubin. Bilirubin is a yellow pigment produced during the breakdown of red blood cells and processed by the liver.

Why might I need this test?

It may be ordered as part of a liver-panel evaluation or when jaundice, dark urine, pale stools, abdominal discomfort, or other symptoms suggest a problem with the liver or bile ducts.

How is the test performed?

A blood sample is collected, and the serum or plasma is tested in the laboratory to determine whether direct-reacting bilirubin is present. Because this is a qualitative test, it does not provide a precise direct-bilirubin concentration.

How do I prepare for the test?

Fasting is usually not required for this test unless your clinician requests it as part of a larger panel. Tell the laboratory if you are pregnant or taking medications that could affect liver function or bilirubin levels.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

If direct-reacting bilirubin is reported as present or increased, it may reflect reduced bile drainage, liver-cell injury, or increased bilirubin production from blood-cell breakdown. Results should be interpreted with total bilirubin and other liver tests, such as alkaline phosphatase and liver enzymes, because symptoms and conditions can affect bilirubin levels.

Short name

Direct bilirubin, qualitative

Frequently asked questions

Is direct bilirubin the same as conjugated bilirubin?
They are closely related, but not always identical. Direct-reacting bilirubin is a laboratory measurement that often includes conjugated bilirubin, particularly when measured by certain methods.
Does a qualitative result give me an exact bilirubin level?
No. A qualitative test indicates whether direct-reacting bilirubin is detected rather than providing a precise concentration. A quantitative bilirubin test may be needed for exact measurement.
Can direct bilirubin be high without obvious symptoms?
Yes. A mild abnormality may be found before symptoms develop, so results should be reviewed by your clinician in the context of your medical history and other laboratory findings.
  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