After delivery, a mother asks the nurse about newborn screening tests. The nurse explains that what is the optimal time for testing for phenylketonuria?
a. In the first 24 hours of life
b. After 2 to 3 days
c. At 4 to 6 weeks of age
d. At 2 months of age
ANS: B
Blood tests for phenylketonuria should be obtained 48 to 72 hours after birth. The newborn will have had enough time to ingest protein through feedings, and the chance of false-negative results will be reduced.
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Indicate whether the statement is true or false
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