direct reacting bilirubin

di·rect re·act·ing bil·i·ru·bin

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.

di·rect re·act·ing bil·i·ru·bin

(dĭr-ekt' rē-akt'ing bil'i-rū'bin)
The fraction of serum bilirubin that 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.