Serum/plasma concentration of total bilirubin

Why This Test Matters

Your liver normally processes bilirubin, which comes from the breakdown of old red blood cells. If your liver isn’t working well, bilirubin can build up in your blood, leading to jaundice (yellowing of skin or eyes). This test helps doctors identify problems like liver disease, gallbladder issues, or hemolytic anemia.

What to Expect Before the Test

No special preparation is needed for this test. You may have a blood draw from a vein in your arm, or if plasma is used, a small tube may be inserted into your vein. The process takes a few minutes, and you can resume normal activities afterward.

Common Causes of Abnormal Results

High bilirubin levels may indicate liver disease, blockages in the bile ducts, or conditions that cause red blood cells to break down too quickly. Low levels are less common but could suggest liver disease or certain medications.

What Your Results Mean

Results are usually reported in milligrams per deciliter (mg/dL). If your bilirubin is higher than expected, your doctor may order additional tests to find the cause. If it’s lower, they may investigate potential medications or conditions affecting liver function.