<prompt> In phenylketonuria FeC13 test with urine gives ...color-GreenBlueRedPurple  <response>: Ans. is a i.e., GreenDiagnosis o Elevated phenylalanine levelso Elevated blood tyrosine levelo Presence of urinary metabolites of phenylalanineo Guthries Test It detects the presence of phenylalanine in serumo FeCI, -- It detects the presence of phenylalanine in urine. FeCl3 is added to patients urine. If it contains phenylalanine, it will turn green.o 2-4 Dinitrophenol hydrazine -- gives yellow precipitate with old urine. 