A parent brings a 2-week-old infant to a clinic for a phenylketonuria rescreening blood test. The test indicates a serum phenylalanine level of 1 mg/dL (60.5 mcmol/L). The nurse reviews this result and makes which interpretation?
It is inconclusive
it is negative
it requires rescreening at age 6 weeks.
It is positive
The Correct Answer is B
A. It is inconclusive
Explanation: A serum phenylalanine level within the normal range is considered conclusive in ruling out phenylketonuria. Inconclusive results typically occur when there are issues with the sample or testing process.
B. It is negative
Explanation:
A serum phenylalanine level of 1 mg/dL (60.5 mcmol/L) in a 2-week-old infant is within the normal range. In the context of phenylketonuria (PKU) screening, a "negative" result means that the phenylalanine levels are within the expected range, and there is no evidence of phenylketonuria.
C. It requires rescreening at age 6 weeks.
Explanation: If the initial screening result is within the normal range, rescreening at age 6 weeks may not be necessary for phenylketonuria. The timing and need for rescreening may vary based on local protocols and individual patient factors.
D. It is positive
Explanation: A positive result for phenylketonuria would indicate that the serum phenylalanine levels are elevated, suggesting a potential diagnosis of PKU. In this case, the result is negative, meaning there is no evidence of PKU.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Crayons and a coloring book:
Incorrect: Crayons and coloring books may not be appropriate for a 12-month-old, as they may pose a choking hazard. Additionally, they might require more direct contact, which may not be ideal under contact precautions.
B. Modeling clay:
Incorrect: Modeling clay may also pose a choking hazard for a toddler. Moreover, it can be messy and may not be suitable for use in a hospital room with contact precautions.
C. Hanging crib toys.
Correct Answer: Hanging crib toys can provide visual and tactile stimulation for the toddler without the need for direct contact. These toys can be attached to the crib, allowing the child to engage with them safely.
D. Large building blocks:
Incorrect: While large building blocks can be suitable for a toddler's developmental needs, they may not be the best option in a confined hospital room under contact precautions. The child's access to and handling of the blocks may be limited in this setting.
Correct Answer is D
Explanation
A. 1 cup cooked rice: This exceeds the 1 oz serving size and is more than what the nurse is recommending.
B. Flour tortilla: The size of a flour tortilla can vary, but it often exceeds the 1 oz serving size, so it may provide more than the recommended amount.
C. 1 cup ready-to-eat cereal flakes: The volume of cereal can vary, and 1 cup of cereal may provide more than 1 oz of grains, depending on the type and density of the cereal.
D. 1 slice whole wheat bread: A standard slice of whole wheat bread typically provides around 1 oz of grains, making it an appropriate choice for the recommended serving size.
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