Total Bilirubin with Direct and Indirect Fraction Analysis (Serum)
This test measures your body’s bilirubin levels, a yellow pigment produced when red blood cells break down. It helps assess liver function, bile flow, and conditions like jaundice or hemolysis.
["Bilirubin helps diagnose liver and blood disorders by checking how well your liver processes and removes bilirubin from your bloodstream."]
Key facts at a glance
- LOINC
- 100690-7
- Short code
- T gondii DNA CSF NAA+probe-Log#
- Synonyms
- T gondii DNA CSF NAA+probe-Log#
- Category
- chemistry
- Sample
- csf
- Container
- Sterile tube
- Units
- N/A
- Fasting
- false
- Population
- adult
- Sex
- all
- Age range
- 18–65 years
- Method
- probe-amp-tar
- Specimen volume
- 1-2 mL
- Stability
- Immediate analysis required, Refrigerated: 1h
- Hemolysis max
- 200
- TAT
- 4–24 hours
- Order
- routine
Why This Test Matters
Bilirubin is a normal byproduct of red blood cell breakdown. High levels can signal liver problems, such as hepatitis, bile duct blockages, or conditions like Gilbert’s syndrome. Low levels may indicate certain blood disorders or liver disease progression.
How the Test Works
Your blood sample is tested to separate bilirubin into two types: indirect (unconjugated) and direct (conjugated). The test measures total bilirubin and often the direct fraction separately to identify where abnormalities may lie.
When You Might Need It
Doctors order this test if you have symptoms like jaundice (yellowing skin/eyes), unexplained fatigue, or if you have a history of liver disease, gallbladder issues, or blood disorders.
What to Expect
A small blood sample is drawn from your arm. You may feel a slight pinch, but it’s quick. No special preparation is needed unless instructed otherwise.
Clinical interpretation
How abnormal results are interpreted and what conditions they suggest.
Clinical Significance
Short name
Total & Direct Bilirubin Test
Frequently asked questions
High total bilirubin (especially indirect) often points to liver dysfunction or hemolysis. High direct bilirubin suggests bile duct obstruction or liver disease. Abnormal results may guide treatment for conditions like hepatitis, cirrhosis, or gallstones.
This test is typically done in a lab and results are usually available within 1–3 days. Follow-up may include additional tests or consultations with a specialist.
Yes, repeated tests may be needed if you have ongoing liver issues or symptoms. Your doctor will explain how often to retest based on your condition.
Sources
- 1
- 2Lab Tests OnlineSource
- 3
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.
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