How do you test bilirubin?

Bilirubin testing is typically performed using a blood sample, which is analyzed to measure the levels of total bilirubin, as well as direct (conjugated) and indirect (unconjugated) bilirubin. The sample is usually taken from a vein in the arm and processed in a laboratory using spectrophotometry or other biochemical methods. Elevated bilirubin levels can indicate liver dysfunction, hemolysis, or bile duct obstruction, among other conditions. In some cases, a urine test may also be conducted to assess bilirubin levels, particularly in diagnosing liver diseases.