A Total Bilirubin test is a common blood test that measures the overall amount of bilirubin circulating in your bloodstream. Bilirubin is a yellow pigment made when your body breaks down old red blood cells. Normally, your liver processes bilirubin, changes it into a form that can be removed, and sends it into bile so it can leave the body through the intestines.

“Total” bilirubin generally reflects the sum of two forms: unconjugated (indirect) bilirubin (before the liver has processed it) and conjugated (direct) bilirubin (after the liver has processed it). Total bilirubin is often checked along with other markers of liver function (such as ALT, AST, alkaline phosphatase, and albumin) to help evaluate liver and bile duct health.

In plain language, higher-than-normal bilirubin can mean your body is making too much bilirubin (for example, from increased red blood cell breakdown, also called hemolysis), your liver is having trouble processing it (seen in many types of liver disease), or bile is not draining normally (a blockage in the bile ducts). Elevated bilirubin can lead to jaundice, which is the yellowing of skin and the whites of the eyes. Lower bilirubin levels are usually not a health concern. Your clinician interprets results based on your symptoms, medical history, and other lab findings.

Doctors commonly order a Total Bilirubin test when someone has symptoms or signs suggesting jaundice or problems with the liver, gallbladder, or red blood cells. It may be done as part of a routine metabolic panel, as a targeted diagnostic test, or for ongoing health monitoring.

Your clinician may recommend this test if you have:

• Yellowing of the skin or eyes (jaundice)
• Dark urine or pale/clay-colored stools (can suggest bile flow problems)
• Itching, abdominal pain (especially right upper abdomen), nausea, vomiting, or loss of appetite
• Unexplained fatigue or weakness
• Symptoms of anemia (such as shortness of breath, dizziness, pale skin), especially when hemolysis is suspected
• Exposure risks or history suggesting hepatitis (viral infection), heavy alcohol use, or medication/supplement side effects that can affect the liver
• Known liver or gallbladder disease, to track severity or response to treatment

This test is also frequently used to help distinguish between different causes of jaundice. For example, a pattern suggesting increased indirect bilirubin may point toward increased red blood cell breakdown or inherited conditions, while higher direct bilirubin can be seen with bile duct blockage or certain liver conditions. Interpretation typically requires additional blood tests (including direct/indirect bilirubin) and sometimes imaging.

• Hepatitis (viral, alcoholic, or drug-induced)
• Cirrhosis and chronic liver disease (including fatty liver disease)
• Bile duct obstruction (e.g., gallstones, strictures)
• Cholestasis (reduced or blocked bile flow)
• Hemolytic anemia and other causes of hemolysis
• Gilbert syndrome (common inherited cause of mild, intermittent elevated bilirubin)
• Autoimmune liver disease (e.g., primary biliary cholangitis, autoimmune hepatitis)
• Pancreatic or biliary tumors causing obstruction

• Evaluating and monitoring liver function as part of routine or preventive care
• Investigating jaundice and related symptoms (yellowing of skin/eyes, dark urine)
• Tracking known liver disease progression and response to treatment
• Assessing possible hemolysis or causes of anemia involving red blood cell breakdown
• Monitoring recovery after gallbladder or bile duct issues (including suspected obstruction)
• General health monitoring when taking medications that may affect the liver