direct reacting bilirubin
the fraction of serum bilirubin which has been conjugated with glucuronic acid in the liver cell to form bilirubin diglucuronide; so called because it reacts directly with the Ehrlich diazo reagent; increased levels are found in hepatobiliary diseases, especially of the obstructive variety.
Synonym(s): conjugated bilirubin
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Examples: glitazone, GI cocktail, etc.