Home » NCLEX » NCLEX-RN » Newborns are routinely screened for phenylketonuria. The nursery nurse ensures that this screening test is performed:
Newborns are routinely screened for phenylketonuria. The nursery nurse ensures that this screening test is performed:
A. Immediately after birth, because the most accurate result is obtained at this time
B. After 23 days of milk ingestion
C. At 23 days of age regardless of amount of milk feedings
D. At 1 month, because the biochemical buildup of phenylalanine takes 1 month to detect
Correct Answer: B
Explanation/Reference:
Explanation:
(A) The infant has not ingested any protein immediately after birth, which is necessary to detect excessive serum phenylalanine. (B) It is important that the infant take in 23 full days of milk or formula feedings to preclude a false-negative reading. (C) At 23 days of age, inadequate milk could have been ingested owing to a delay in the initial feeding. (D) The biochemical buildup of serum phenylalanine is detectable after 23 days of milk or formula ingestion.
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