Bilirubin (Direct)
Direct (conjugated) bilirubin measures the portion of bilirubin that has been processed by the liver and made water-soluble for excretion.
Category: Liver Function
Also known as: direct bilirubin, conjugated bilirubin, dbil, d. bilirubin, direktni bilirubin, vezani bilirubin
Reference range: 0–0.3 mg/dL (Source: ABIM)
Standard unit: mg/dL
High values may indicate
High direct bilirubin may indicate bile duct obstruction, gallstones, liver diseases such as hepatitis or cirrhosis, or Dubin-Johnson syndrome.
Low values may indicate
Low direct bilirubin is generally not a clinical concern and is usually considered normal.
Frequently asked questions
- What is a normal Bilirubin (Direct) level?
- A typical reference range for Bilirubin (Direct) is 0–0.3 mg/dL (source: ABIM). Reference ranges vary by laboratory, age, and sex, so always compare against the range on your own lab report.
- What units is Bilirubin (Direct) measured in?
- Bilirubin (Direct) is most commonly reported in mg/dL. Labs in different countries may use other units — you can convert between them with BloodId's blood test unit converter.
- Where do Bilirubin (Direct) reference ranges come from?
- BloodId uses ABIM standard reference ranges and educational information from MedlinePlus (see our methodology). Reference ranges still vary by lab, age, and sex, so always compare against your own report.
- Can I track Bilirubin (Direct) over time?
- Yes. Upload results from any lab and BloodId charts your Bilirubin (Direct) over time against its reference range, so you can see whether the trend is rising, falling, or stable.
Related biomarkers
Source: MedlinePlus, U.S. National Library of Medicine
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