 In complete obstruction of the bile duct, conjugated bilirubin cannot access the intestinal tract → no further bilirubin conversion to urobilinogen → no stercobilin or urobilin.Instead, excess conjugated bilirubin is filtrated into the urine without urobilinogen in obstructive jaundice.Conjugated bilirubin in urine (bilirubinuria) gives urine an abnormally dark brown color.