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.

Question

Quizplus · Accepted Answer

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.

The Screening Test for PKU Is Most Reliable If the Blood