Serum or plasma concentration of bilirubin (total)

What Is Bilirubin?

Bilirubin is a waste product created when your body recycles old red blood cells. Normally, it’s filtered out of your blood by your liver and excreted through bile into your intestines. When bilirubin builds up in your blood, it can cause jaundice, a condition where your skin and eyes turn yellow.

Why Might You Need This Test?

Your doctor may order this test to check for liver problems, such as hepatitis, cirrhosis, or blockages in your bile ducts. It can also help diagnose conditions like hemolytic anemia, where red blood cells break down too quickly, or certain types of cancer.

How Is the Test Done?

A blood sample is taken from a vein in your arm. The sample is sent to a lab where it’s analyzed to measure the total bilirubin level. No special preparation is usually needed, but let your doctor know if you’re taking medications that could affect results.

What Are Common Results?

Results are reported in milligrams per deciliter (mg/dL). High levels may indicate liver or bile duct problems, while very low levels are rare and often linked to rare genetic disorders.