Direct Bilirubin Measurement

**Semantic type:** Laboratory Procedure

**Definition:** The bilirubin is bound to glucuronide to form conjugated bilirubin (direct bilirubin). Direct Bilirubin measurement is accomplished by a colorimetric method. Direct Bilirubin in biological fluids reacts with sulfanilic acid at acidic pH to produce a red colored complex. The optical density of produced color has a direct relationship with Direct Bilirubin concentration in the solution.

**Synonyms:** - BILDIR - Conjugated Bilirubin + Albumin-Bound Bilirubin - Conjugated Bilirubin + Delta Bilirubin - Direct Bilirubin - Direct Bilirubin - Direct Bilirubin