The screening test for PKU is most reliable if the blood sample is:
a. from cord blood.
b. taken 14 days after birth.
c. taken before oral feedings are initiated.
d. fresh blood from the heel.
ANS: D
Fresh heel-stick blood is the preferred source for the test. Fresh heel-stick blood, not cord blood, must be used. The test must be performed soon after birth so that a low-phenylalanine diet can be instituted if required. The newborn should ingest breast milk or formula before the test is performed.
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