Definition: a test for the presence of ketonuria; a sample of the suspected urine is shaken up with a few drops of sodium nitroprusside, and a strong solution of ammonia water is then gently poured over the mixture; if acetone is present, a magenta ring forms at the line of contact; tablets containing sodium nitroprusside and alkali are now more commonly used.
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Examples: glitazone, GI cocktail, etc.