Phenylketonuria (PKU) Test

PKU (Phenylketonuria) Screening

How To Prepare

Your baby should be drinking breast milk or formula for 24 hours before the blood sample is taken. PKU test results are more likely to be correct if the blood sample is taken after the baby has been drinking milk or formula for at least 48 hours.

If your baby is older than 6 weeks, he or she will have a PKU urine test. You do not need to do anything before your baby has this test.

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Author:	Carrie Henley Jan Nissl, RN, BS	Last Updated: May 26, 2006
Medical Review:	Michael J. Sexton, MD - Pediatrics Thomas Emmett Francoeur, MDCM, CSPQ, FRCPC - Pediatrics
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