Phenylketonuria (PKU) Test

Phenylketonuria (PKU) Test

Results

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

Normal

Phenylketonuria (PKU) blood test 2
Normal:

Less than 2 milligrams per deciliter (mg/dL) or less than 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.

Author:
Healthwise Staff
Medical Review:
John Pope, MD - Pediatrics
Chuck Norlin, MD - Pediatrics
Last Updated:
June 19, 2012
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