Total Bilirubin Test
A total bilirubin test measures bilirubin, a yellowish substance that forms when red blood cells are broken down and that the liver processes for removal. Clinicians often use it as part of a broader look at liver and blood cell health.
About this test
Bilirubin is a pigment created when the body recycles aging red blood cells. As those cells reach the end of their life, the hemoglobin inside them is broken down, and bilirubin is one of the products left behind.
This test is done with a simple blood draw at a patient service center. A phlebotomist collects a sample from a vein, usually in the arm, and the sample travels to the laboratory.
Who might consider this test?
- Look into a total bilirubin test when they or their clinician are exploring signs that can be linked to the liver or to red blood cell turnover
- Such as yellowing of the skin or eyes
- Changes in the color of urine or stool
Test details
| Quest code | 287 |
|---|---|
| Methodology | Spectrophotometry |
| Sample type | 1 mL serum - protected from light |
| Collection | Quest patient service center |
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Additional details
What this test looks at
The total bilirubin result captures the combined amount of bilirubin traveling in the bloodstream. Bilirubin exists in more than one form: a portion that has already been processed by the liver and a portion that has not yet been. A total measurement rolls these together into a single figure, which is why a clinician sometimes follows it with a fractionated test that separates the forms when a closer look is warranted.
It helps to remember what the number represents. Bilirubin sits at the meeting point of two systems, the recycling of red blood cells and the work of the liver, so a single reading describes a moment in that ongoing process rather than a fixed verdict about either system on its own.
How it's often used alongside other tests
Total bilirubin rarely travels alone. It commonly appears within a liver panel next to enzymes such as ALT, AST, and alkaline phosphatase, and it may be paired with a complete blood count when red blood cell breakdown is part of the question. Read together, these markers give a clinician a fuller sense of what may be influencing the bilirubin picture than any single value could provide.
Order online and a physician order is included — no doctor's visit and no insurance needed. Your sample is collected at a Quest Diagnostics patient service center.
Laboratory results should always be interpreted by a licensed clinician who knows your health history. This page is information about a test, not medical advice.
Frequently asked questions
What does a total bilirubin test measure?
It measures the combined amount of bilirubin in the blood. Bilirubin is a yellow waste product formed when red blood cells are broken down, and the liver processes it for removal from the body.
Why might someone consider this test?
People often consider it when exploring signs that can be linked to the liver or to red blood cell turnover, or when it appears as part of a routine liver or metabolic panel ordered by a clinician.
How is the sample collected?
Through a routine blood draw at a patient service center. A phlebotomist takes a small sample from a vein in the arm and sends it to the laboratory for analysis.
Do I need to fast before a bilirubin test?
Preparation varies. Some clinicians ask for fasting when bilirubin is drawn as part of a larger panel, so people should follow whatever instructions their ordering clinician provides.
What is the difference between total and direct bilirubin?
Total bilirubin combines all forms circulating in the blood, while direct bilirubin measures only the portion already processed by the liver. A clinician may order a fractionated test to separate them.
How much does the Bilirubin Total test cost?
The cash price at Celio Health is $24. That covers the physician's order and sample collection at a Quest patient service center — no insurance is needed and there's no separate doctor's visit to pay for.