ferric chloride test

fer·ric chlo·ride test

a qualitative test for the detection of phenylketonuria; the addition of ferric chloride to urine gives rise to a blue-green color in the presence of phenylketonuria.
Farlex Partner Medical Dictionary © Farlex 2012
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Silverwood Lake state project water was used for all tests except the 4-mg/L ferric chloride test, which used Lake Perris.