What is the screening procedure?

what is the screening procedure of phenylketonuria?
what is its procedure and give interpretation of the report.
Answers:
It's a simple blood test, usually a heelstick done immediately following birth, that indirectly test for the presence of the enzyme which metabolizes the amino acid phenylalanine. The report comes back as either soaring phenylalanine (>2mg/dL) which is abnormal, or normal.

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