The nurse provides instructions to the parent of a newborn to bring the infant to the well-baby clinic for a phenylketonuria (PKU) rescreening blood test. The parent brings the infant to the clinic, and the blood test is drawn
The results of the test indicate a serum phenylalanine level of 1.0 mg/dL. The nurse interprets these results as: 1. Positive
2. Negative
3. Inconclusive
4. Requiring rescreening at age 6 weeks
2
Rationale: Phenylketonuria (PKU) is a genetic disorder that is characterized by an inability of the body to utilize the essential amino acid, phenylalanine. Phenylalanine level is checked to screen for this disorder. A normal phenylalanine level in a newborn is 1.2 to 3.4 mg/dL. A result of 1.0 mg/dL is a negative test result. "Positive," "inconclusive," and "requiring rescreening at age 6 weeks" are incorrect.
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