Phenylketonuria (PKU) Test

PKU (Phenylketonuria) Screening

Results

A phenylketonuria (PKU) test is done to check whether a new baby has the enzyme to use phenylalanine in his or her body.

Normal

Phenylketonuria (PKU) blood test

Normal:	Less than or equal to 2 milligrams per deciliter (mg/dL) or less than or equal to 121 micromoles per liter (mcmol/L) (SI units)

If the heel stick test shows high phenylalanine levels, a blood sample is taken from your baby's vein to confirm whether he or she has PKU.

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Author:	Debby Golonka, MPH	Last Updated: February 27, 2008
Medical Review:	Michael J. Sexton, MD - Pediatrics Thomas Emmett Francoeur, MDCM, CSPQ, FRCPC - Pediatrics
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