Bilirubin is normally measured with a blood test. A healthcare professional will collect a blood sample from your vein and send it to a lab for analysis. The test determines your total and direct bilirubin levels. Indirect bilirubin is what is left after subtracting direct bilirubin from the total.
Bilirubin tests are usually ordered to monitor liver health. Indirect bilirubin is the unconjugated form of bilirubin in the blood. It is carried from the blood to the liver where it is conjugated to its direct form and excreted into the intestines. Indirect and direct bilirubin together make up total bilirubin.
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