<prompt> Positive Ferric chloride urine test is due to:PhenylalaninePhenylacetatePhenylpyruvatePhenylaspaate  <response>: Diagnostic test for phenylketonuria: This is a screening test in urine sample for phenyl ketones and hence gives positive result for phenyl pyruvate Positive for:- Phenylketonuria Tyrosinemia MSUD Alkaptonuria 