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Bilirubin, Total (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 is processed by your liver.

Quick summary

["Bilirubin helps diagnose liver function and bile flow issues."]

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

Key facts at a glance

LOINC
7358-5
Short code
Kent blue grass BasoBnd Ab Qn
Synonyms
Kent blue grass BasoBnd Ab Qn
Category
chemistry
Sample
whole-blood
Container
Lavender-top (EDTA)
Units
N/A
Fasting
false
Population
adult
Sex
all
Age range
18–65 years
Method
lhr
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

Your healthcare provider may order this test to check for liver disease, bile duct blockages, or other conditions that affect how your body processes bilirubin. It can also help monitor conditions like hemolytic anemia (where red blood cells break down too quickly) or jaundice (yellowing of the skin and eyes).

What to Expect Before the Test

No special preparation is needed for this blood test. You may be asked to fast for 8–12 hours before the draw if your provider specifies it, but this is not always required. Bring your test results or questions to your appointment.

What Happens During the Test

A healthcare professional will insert a small needle into a vein in your arm to draw a blood sample. You may feel a brief pinch, but it usually doesn’t cause significant discomfort. The sample is then sent to a lab for analysis.

What the Results Mean

Results are compared to standard ranges, but your actual values will depend on your health status. High bilirubin levels may indicate liver problems, while low levels are less commonly significant unless related to conditions like liver disease or certain medications.

Clinical interpretation

How abnormal results are interpreted and what conditions they suggest.

◆Associated findings1

Short name

Total Bilirubin

Frequently asked questions

What causes elevated bilirubin levels?
Elevated bilirubin can result from liver diseases (like hepatitis or cirrhosis), bile duct blockages, hemolytic anemia (rapid red blood cell breakdown), or certain medications. Your provider will consider your full medical history and other test results to determine the cause.
How long does it take to get results?
Results are typically available within 1–3 business days, depending on your lab’s processing time. Some providers may request follow-up testing if initial results are abnormal.
Can diet affect bilirubin levels?
Dietary factors like high-fat foods or certain medications may indirectly influence liver function, but they don’t directly alter bilirubin levels. Always follow your provider’s advice regarding diet and supplements during testing.
  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