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Direct Bilirubin
Access Medical Labs · Quest Diagnostics2 test optionsFrom $3.53
Direct Bilirubin
Access Medical Labs · Quest DiagnosticsCatalog information reviewed: August 24, 2026 by the Sunridge Medical clinical team.
What this laboratory test evaluates
Bilirubin, Direct
This test measures the level of conjugated bilirubin in the blood. Direct bilirubin is water-soluble and is produced when the liver processes waste products. This test is essential in assessing liver function and diagnosing liver diseases such as hepatitis, cirrhosis, and bile duct obstruction. It can also help detect conditions that cause increased destruction of red blood cells.
What patients is this test right for?This test may be recommended for individuals who require monitoring for the health of the liver or who exhibit symptoms of liver disease or bile duct obstruction, such as jaundice. Symptoms of jaundice include:• Yellowing of the skin and eyes
• Dark urine
• Itching
• light-colored stools
• Abdominal pain
• Fever or chills
What type of sample is required for this test?1 mL serum – protected from light.
Proper handling is crucial.
Plasma collected in: Lithium heparin (green-top) tube or sodium heparin (green-top) tube.
Serum transferred to an amber transport vial.
Test ResourcesFor more information, please consult your healthcare provider.
Additional test information
Bilirubin, Direct – This test measures the level of conjugated bilirubin in the blood. Direct bilirubin is water-soluble and is produced when the liver processes waste products. This test is essential in assessing liver function and diagnosing liver diseases such as hepatitis, cirrhosis, and bile duct obstruction. It can also help detect conditions that cause increased destruction of red blood cells.
Collection and processing
- Sample type: Serum
- Fasting: No
- Estimated laboratory processing: Results should be available in 2 – 5 business days after the sample is collected
How Sunridge uses laboratory information
Sunridge considers the medical question, symptoms, history, medications, prior results, and whether the finding could change care before recommending testing. A laboratory result is not interpreted in isolation and does not establish a diagnosis by itself.
Before requesting this test
Availability, collection requirements, eligibility, and processing estimates can change. Sunridge reviews each request and, when appropriate, creates the order through Fullscript. Follow the current instructions supplied with the approved order.
Common questions about this laboratory test
- What sample does this test require?
- The listed sample type is Serum. Confirm current collection instructions in the approved order.
- Does this test require fasting?
- The current catalog record lists fasting as: No. Follow the instructions supplied with the approved order.
- How long does laboratory processing usually take?
- Results should be available in 2 – 5 business days after the sample is collected. Timing can change after collection or if a laboratory requires additional review.
About this test
Bilirubin, Direct
This test measures the level of conjugated bilirubin in the blood. Direct bilirubin is water-soluble and is produced when the liver processes waste products. This test is essential in assessing liver function and diagnosing liver diseases such as hepatitis, cirrhosis, and bile duct obstruction. It can also help detect conditions that cause increased destruction of red blood cells.
What patients is this test right for?This test may be recommended for individuals who require monitoring for the health of the liver or who exhibit symptoms of liver disease or bile duct obstruction, such as jaundice. Symptoms of jaundice include:• Yellowing of the skin and eyes
• Dark urine
• Itching
• light-colored stools
• Abdominal pain
• Fever or chills
What type of sample is required for this test?1 mL serum - protected from light.
Proper handling is crucial.
Plasma collected in: Lithium heparin (green-top) tube or sodium heparin (green-top) tube.
Serum transferred to an amber transport vial.
Test ResourcesFor more information, please consult your healthcare provider.
Additional details
Bilirubin, Direct - This test measures the level of conjugated bilirubin in the blood. Direct bilirubin is water-soluble and is produced when the liver processes waste products. This test is essential in assessing liver function and diagnosing liver diseases such as hepatitis, cirrhosis, and bile duct obstruction. It can also help detect conditions that cause increased destruction of red blood cells.
Highlighted health areas
- Liver/Gallbladder
Biomarkers and report focus
The exact analytes and report format can change. Confirm the current contents in the Fullscript order before payment.
- Direct Bilirubin