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Medical Definition of Fouchet's reagent
1. A 25% solution of trichloroacetic acid, containing 0.9% ferric chloride; a drop of the reagent added at the surface line of barium chloride-impregnated filter paper which has been dipped in urine for 10 sec will give a green colour if bilirubin is present. See: Fouchet's stain. (05 Mar 2000)