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Total Bilirubin (Serum)

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

This test measures the total amount of bilirubin in your blood. Bilirubin is a yellow pigment produced when red blood cells break down, and it helps your liver process waste products.

Quick summary

["Your doctor may order this test to check for liver or bile duct problems."]

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

Key facts at a glance

LOINC
54926-1
Short code
t(ABL1,BCR)e19a2 # Bld/T
Synonyms
t(ABL1,BCR)e19a2 # Bld/T
Category
coagulation
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
molgen
Specimen volume
3 mL
Stability
Room temperature: 4h, Refrigerated: 24h
Hemolysis max
0
Lipemia max
0
Icterus max
0
TAT
4–24 hours
Order
routine

Why This Test Is Done

Doctors may perform a total bilirubin test to diagnose or monitor conditions affecting the liver, bile ducts, or red blood cells. Common reasons include unexplained jaundice (yellowing of skin or eyes), liver disease, hemolytic anemia (red blood cell destruction), or bile duct blockages. It can also help assess how well your liver is functioning or identify underlying issues causing elevated bilirubin levels.

What to Expect Before the Test

No special preparation is usually needed. You may be asked to fast for 8–12 hours before the test if your lab requires it, but always follow your healthcare provider’s instructions. Bring any medications you’re taking, as some may affect results.

During the Test

A healthcare professional will draw blood from a vein in your arm using a small needle. You may feel a brief sting, but the process is quick and typically painless. The blood sample is sent to a lab for analysis.

After the Test

You can resume normal activities immediately. There may be mild bruising or soreness at the injection site, but this usually fades within a day or two. If you experience excessive bleeding, swelling, or signs of infection (like redness or fever), contact your doctor.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Serum Bilirubin

Frequently asked questions

What causes high bilirubin levels?
High bilirubin can result from liver problems (e.g., hepatitis), blockages in the bile ducts, or conditions that destroy red blood cells more quickly than the liver can process the pigment. Lifestyle factors like alcohol use or certain medications may also play a role.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing schedule. Your doctor will discuss the findings with you during your follow-up visit.
Can I eat before this test?
Check with your doctor or lab technician first, as fasting may be required for accurate results in some cases. If fasting isn’t needed, eating a normal meal beforehand is fine.
  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