nitroprusside test

ni·tro·prus·side test

a qualitative test for cystinuria; following the addition of sodium cyanide to the urine, the further addition of nitroprusside produces a red-purple color if the cyanide has reduced any cystine present to cysteine.

nitroprusside test

(1) An obsolete test for the presence of acetone in the urine.
(2) Cyanide-nitroprusside test (for cystine and homocystine).

ni·tro·prus·side test

(nī'trō-prŭs'īd test)
A qualitative procedure for cystinuria; following the addition of sodium cyanide to the urine, the further addition of nitroprusside produces a red-purple color if the cyanide has reduced any cystine present to cysteine.
References in periodicals archive ?
The usual method for detection of serum ketone is the nitroprusside test.
Following laboratory investigations were included in the screening protocol - dicts test for reducing substances, Ferric chloride test for Phenylketonuria, Dintrophenylhydrazine test for alpha keto acids, Nitrosonaphthol test for tyrosine, Para nitroaniline test for methylmalonic aciduria, Cyanide nitroprusside test for cysteine and homocysyteine, Ammoniacal silver nitrate test for homocysteine, Thin layer chromatography for amino acids.
The nitroprusside test can also produce false-positive results in the presence of phenylketones, bromosulfophthalein, and sulfhydryls (66).