Bilirubin: About This Test

What is it?

A bilirubin test measures the amount of bilirubin in your blood. Bilirubin is a substance produced when the liver breaks down old red blood cells. When bilirubin levels are high, the skin and whites of the eyes may look yellow (jaundice). This may be caused by liver disease.

Why is this test done?

This test looks at how well your liver is working. It watches for signs of liver disease, such as hepatitis, or the effects of medicines that can harm the liver. It also can see if something is blocking the bile ducts. It can help with decisions about whether newborns with jaundice need treatment.

How do you prepare for the test?

In general, there is nothing you have to do before this test, unless your doctor tells you to.

How is the test done?

A health professional uses a needle to take a blood sample, usually from the arm.

How long does the test take?

The test will take a few minutes.

What happens after the test?

• You will probably be able to go home right away.
• You can go back to your usual activities right away.