Total Bilirubin, Serum

A bilirubin test is typically done to help your doctor evaluate how well your liver is working. It may be ordered if you have symptoms such as yellowing of the skin or eyes (jaundice), dark urine, pale stools, fatigue, nausea, or abdominal pain. The test can also help investigate anemia or a possible bile duct blockage, and it can be used to monitor how well a treatment is working over time.

Your healthcare provider may order this test if you have symptoms like jaundice (yellowing of skin/eyes), dark urine, pale stools, or unexplained fatigue. It’s also used to monitor liver function, detect bile duct blockages, or check for hemolytic anemia (red blood cell breakdown).

For this test, a healthcare professional will draw a small sample of blood from a vein, usually on the inside of your elbow or the back of your hand. The process takes only a few minutes, and you may be asked to fast for several hours beforehand to ensure accurate results. You might feel a quick sting when the needle is inserted. Afterward, a small bandage is applied, and your sample is sent to a laboratory, with results usually ready within a day or two.

A small blood sample is drawn from a vein, usually in your arm. You may feel a slight pinch, but it’s quick. No special preparation is needed unless instructed otherwise.

For most healthy adults, normal total bilirubin levels fall between 0.1 and 1.2 mg/dL, although exact reference ranges can vary slightly from one laboratory to another. An abnormal result usually means your bilirubin level is higher than expected, a condition known as hyperbilirubinemia. Elevated bilirubin can be a sign of liver disease, a blocked bile duct, or an increased breakdown of red blood cells, and your doctor will interpret your results along with your symptoms and other tests.

Results are interpreted by your provider based on your health history and symptoms. Elevated levels may indicate liver disease, bile duct problems, or red blood cell disorders. Lower levels alone are rarely concerning unless part of a broader evaluation.

Abnormal bilirubin levels are often linked to conditions such as hepatitis, cirrhosis, Gilbert's syndrome, gallstones that block the bile ducts, and hemolytic anemia, in which red blood cells are destroyed faster than the body can replace them. In newborns, high bilirubin can cause neonatal jaundice, which is common and often temporary but should be monitored carefully to prevent serious complications.

High bilirubin can signal conditions like hepatitis, cirrhosis, gallstones, or hemolytic anemia. Low levels may occur with certain medications or liver diseases but aren’t always a standalone issue.