Step I Testing for Cystine stones?!

Started by Silverish
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Silverish

Silverish

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First Aid says you do a Sodium cyanide nitroprusside test (+).
Does anyone have a clue why? I have no idea why.
 
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Cyanide converts cystine to cysteine and, when present, nitroprusside binds cysteine. The binding of cysteine by nitroprusside elicits a deep purple color, which is interpreted as cystine being present, and thus a positive test result.
 
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