NBME 21

nbme21/Block 3/Question#10

A 30-year-old man has had intermittent severe lower ...

Cysteine

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submitted by haliburton(0),

FA 2017: Urinary cyanide-nitroprusside test is diagnostic. not sure how to know that it was a red color, but maybe just the fact that red seemed like a positive test result.

link to more background but not necessarily helpful for this question