Bilirubin, Fractionated (Total, Direct, and Indirect)
Splits bilirubin into direct and indirect to pinpoint why it is elevated and whether jaundice is liver- or blood-related.
Consider this test if:
- Yellowing of the eyes or skin, dark urine, or pale stools
- A total bilirubin came back high and you need to know which fraction is driving it
- Investigating possible Gilbert syndrome, which raises indirect bilirubin and is harmless
- Sorting hemolysis from liver or bile duct causes of an abnormal result
- Tracking known liver or gallbladder disease over time
- HSA/FSA eligible
- Typical results in 1 day · Reviewed by a real clinician
- Drawn at a CLIA/CAP-accredited lab near you ·
Pre-test considerations
Fasting is not required, though some labs prefer a morning draw. Prolonged fasting and dehydration can raise bilirubin, and the indirect fraction in particular rises with Gilbert syndrome during fasting or illness. Severe hemolysis or lipemia in the sample can invalidate the result.
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What this test is for
Bilirubin is the yellow pigment produced when red blood cells break down; the liver conjugates it and clears it through bile. This test reports all three fractions: total, direct (conjugated), and indirect (unconjugated), and the split is what makes it useful. A high indirect fraction points toward bilirubin overproduction (hemolysis) or reduced conjugation, including Gilbert syndrome, while a high direct fraction points toward liver cell injury or obstructed bile flow such as gallstones or bile duct disease. It is the standard test for working up jaundice, yellowing of the eyes or skin, dark urine, or an elevated bilirubin flagged on routine bloodwork.
A total-only or total-and-direct result tells you bilirubin is high; this fractionated version adds the indirect calculation, which is what separates a benign Gilbert pattern from liver or biliary disease. For a full liver assessment alongside enzymes and protein, the hepatic function panel is the broader test.
Biomarkers tested
Includes 3 biomarkers
Direct bilirubin measures the conjugated fraction that your liver has already processed and packaged for excretion into bile, distinct from the unconjugated bilirubin still circulating unbound. When direct bilirubin rises, it points to a downstream problem: bile duct obstruction, gallstones, or liver cells struggling to excrete what they've already conjugated, rather than an upstream issue like excess red blood cell breakdown. It's the marker that helps separate liver and bile duct disease from other causes of jaundice, and it's worth checking alongside ALT, AST, and alkaline phosphatase if you're dealing with yellowing skin or eyes, dark urine, pale stools, or unexplained itching.
- Specimen
- Serum or plasma
- Measures
- Mass concentration
- Specimen
- Serum or plasma
- Measures
- Mass concentration
Total bilirubin measures the pigment left over when your body breaks down old red blood cells, a job the liver clears by processing it into bile. High levels point to a liver struggling to keep up (hepatitis, fatty liver, bile duct blockage) or red cells breaking down faster than normal, and often show up as yellowing skin or eyes, dark urine, or fatigue. It pairs with ALT, AST, and ALP to pinpoint whether a problem sits in the liver cells, the bile ducts, or upstream in the blood itself, and mildly elevated results with otherwise normal liver panels usually reflect Gilbert's syndrome, a harmless and common genetic quirk.
- Specimen
- Serum or plasma
- Measures
- Mass concentration
What to expect
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- 2 Quick lab visit
Testing to fit your busy schedule, usually 15 minutes or less. Walk-in and appointments available.
- 3 Typical results in 1 day
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- 4 Expert guidance
Included with Mito membership. A clinician reviews your results and your personalized action plan follows, with clear next steps.
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Frequently asked questions
View all FAQsHow does pricing work?
Every test shows the member price next to the standard non-member price, so you can see what membership saves you. The member price is our cost — covering the lab and what it takes to run the service — never a profit on the test itself; Mito makes its money on the $9 membership, not on marking up your tests. Membership is $9/mo, and you still pay the lab’s order fee. Prices are itemized before you pay, with no hidden fees.
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Is this eligible for HSA/FSA?
Yes. This test is HSA/FSA eligible, and you can pay with your HSA/FSA card at checkout.
When will I get my results?
Your results post to your dashboard once your lab completes them, then a clinician reviews them and your full analysis and personalized action plan (with clear next steps) follow. Turnaround varies by test: specialty assays and at-home kits take longer, and each test shows its expected turnaround before you buy.
Do I need a doctor’s order?
No. Mito provides the lab order for you, so you can book and get tested without a separate doctor visit.
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