cyanide-nitroprusside test

cy·an·ide-·ni·tro·prus·side test

a qualitative test for diagnosis of cystinuria; the addition of fresh sodium cyanide formed by sodium nitroprusside to a sample of urine gives rise to a stable red-purple color in the presence of cystine.
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When homocystinuria is a possibility, a cyanide-nitroprusside test for urine disulfides should be done.