Liver
Total Bilirubin
Total Bilirubin is a liver biomarker reported in mg/dL.
- Short name
- TBIL
- Unit
- mg/dL
- Reference min
- 0.1
- Reference max
- 1.2
- Optimal min
- 0.3
- Optimal max
- 0.8
- Better when
- in range
- Reference min (male)
- 0.1
- Reference max (male)
- 1.2
- Reference min (female)
- 0.1
- Reference max (female)
- 1.2
- Sample
- serum
- Fasting required
- false
- Related markers
- Direct Bilirubin, Indirect Bilirubin, Alanine Aminotransferase
Moved by
Interventions that trials measured against this marker, and which way it moved.No trial has measured Total Bilirubin against an intervention in this library yet.
Full write-up
What is it
Total Bilirubin, abbreviated TBIL, is a liver biomarker reported as a concentration. It provides a standardized way to describe bilirubin in relation to the liver, and the abbreviation may appear in place of the full name on reports.
How to test it
Total Bilirubin is measured in a serum sample and reported in mg/dL. Fasting is not required for this test, so the sample can be arranged without a fasting period.
Results are interpreted against the reference and optimal ranges shown on the page. When additional context is needed, clinicians may consider related measurements such as Bilirubin Direct, Bilirubin Indirect, and Alt alongside Total Bilirubin. The meaning of a result depends on the broader clinical situation, so questions about testing or interpretation are best discussed with a clinician.
Reading your result
Total Bilirubin is reported from a serum sample and should be interpreted using the reference range and unit printed on the laboratory report. Laboratories may use different ranges or units, so a number is meaningful only in the context of the report that produced it.
The reference range describes the broader interval used for comparison. The optimal range is a tighter interval within that reference range and represents a narrower target for interpretation; being outside the optimal range does not, by itself, establish a health problem.
A single bilirubin value is not a diagnosis. Results outside the report’s reference range should be discussed with a clinician, who can interpret the finding in the context of the full clinical picture.
What moves it
Total Bilirubin was measured directly in studies of several interventions, but the findings were not uniform. Panax Ginseng, SAM-e, Reishi, and Curcumin were associated with decreases in the marker, while Milk Thistle (Silymarin), Resveratrol, Quercetin, and Zinc did not produce a meaningful change in the reported studies.
Because the preferred direction for Total Bilirubin is a range rather than simply “lower,” a decrease should not automatically be interpreted as an improvement. The clinical meaning depends on where the result began, where it ended, and the broader clinical context. The studies assessed the marker over periods ranging from 1.0 to 48.0 weeks, so timing can affect how a result is interpreted.
These findings describe group-level study results rather than a guaranteed response for an individual. They also do not establish that any intervention is appropriate for a particular cause of an abnormal bilirubin result. Anyone evaluating a medical condition or persistent laboratory change should discuss the result and its context with a clinician.