diazo reaction(redirected from Ehrlich diazo reaction)
the reaction of diazotized sulfanilic acid with bilirubin to form azobilirubin, which forms the basis of quantitating the amount of bilirubin in biologic fluids. See: van den Bergh test.
Synonym(s): Ehrlich diazo reaction
A deep red color in urine, produced by the action of p-diazobenzene-sulfonic acid and ammonia on aromatic substances found in the urine in certain conditions.