Total bilirubin shows how well your liver clears bilirubin, a yellow pigment from red blood cells.
Bilirubin is a yellow pigment made when old red blood cells are broken down. The liver processes it and passes it into bile, which is then removed through the gut.
Total bilirubin measures all of it in your blood, both the part already processed by the liver (direct) and the part not yet processed (indirect).
A high total bilirubin can cause jaundice, a yellowing of the skin and eyes. The cause can be faster red cell breakdown, a liver that is not processing bilirubin well, or blocked bile flow.
A common and harmless cause of mildly raised bilirubin is Gilbert's syndrome, an inherited trait that affects how bilirubin is processed. Splitting total into direct and indirect helps find the cause.
Aniva reads your result against research-backed ranges, not just the lab's wide normal. The reference shown below is specific to this biomarker.
| Measure | Serum bilirubin (SI) |
| Total bilirubin | ~3 to 21 µmol/L |
| Direct (conjugated) | up to ~5 µmol/L |
Ranges are guidance only and vary by lab and assay. To convert, 1 mg/dL is about 17.1 µmol/L. Read your result against your own lab's reference interval, in line with DGKL practice.
Bilirubin breaks down when a sample is exposed to light, which can lower the reading. Fasting can raise it slightly, and so can Gilbert's syndrome. Haemolysis of the sample affects the result. Some medicines shift the level.
Best read with direct bilirubin, ALT, AST, GGT, and alkaline phosphatase, and with a full blood count when red cell breakdown is suspected.
What does a high total bilirubin mean? It often means the liver is not clearing bilirubin well, bile flow is slowed, or red blood cell breakdown is increased.
Do medications or supplements affect results? Yes. Some antibiotics, HIV medicines, and rifampin can raise it. High-dose vitamin C may falsely lower it.
Do I need to fast for this test? No. Fasting is not required, though very strict fasting can temporarily raise levels.
How often should I test? As advised by your clinician. It’s often checked with a liver panel for symptoms or when monitoring medicines or known liver disease.
How long do results take? Results are usually ready in about 7 days.
What should I discuss with my clinician? Share symptoms, medication and supplement use, alcohol intake, recent illnesses, and any history of Gilbert syndrome.
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