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Metabolism & organs
Direct bilirubin test
The conjugated (water-soluble) form of bilirubin; elevations may suggest bile-duct obstruction or hepatocellular disease.
At a glance
In about 5 days
Most results are ready in about 5 days. Some specialty markers can take up to 21 days.
Check before your draw
This marker has no preparation tag, but it can still need preparation. Contact us before your draw if you’re not sure.
Walk in at Quest
Your lab order arrives by email. Most Quest locations take walk-ins, so bring it with a photo ID.
What it measures
Your liver processes bilirubin, a yellow substance left over when old red blood cells break down, and sends it out in bile, a digestive fluid. This test measures only the processed part.
Why it matters for women
Gallstones are more common in women, especially during pregnancy or with estrogen birth control or hormone therapy, and a stone blocking a bile duct can raise this level. Cholestasis of pregnancy, a liver condition that can cause intense itching late in pregnancy, can raise it too, though a bile acid test is the main check for it.
You might check it if…
- you’ve noticed yellowing of your skin or eyes
- you’ve had dark urine or pale stools
- you get pain in your upper right belly after meals
- you’re pregnant and itchy, especially on your hands and feet
What your result may mean
High Direct bilirubin: what it may mean
High direct bilirubin may mean bile isn't draining normally from your liver, which can happen with a blocked bile duct, slowed bile flow (cholestasis) or liver cell injury. Gallstones can be more common in women, especially during pregnancy or with estrogen birth control or hormone therapy. Cholestasis of pregnancy can raise it too and can cause intense itching late in pregnancy, though a clinician may rely on a bile acid test. You may notice yellow skin or eyes (jaundice), dark urine or pale stools.
Low Direct bilirubin: what it may mean
Low direct bilirubin may be normal, and it may have no clinical meaning on its own. Most bilirubin in healthy blood can be the unprocessed kind, so a low or undetectable direct result can be expected. It may simply mean your liver is moving bile along as it should. It can't rule out gallstones or liver problems alone, and a clinician may still check bile acids for intense itching late in pregnancy.
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These notes provide context and do not diagnose a condition. Not yet available in NY, NJ, RI, HI, ND, SD or WV.