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.

Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. A highly pruritic profuse macule to papule rash on the trunk.
Explanation: This description does not align with the typical presentation of erythema infectiosum. The rash in fifth disease is not highly pruritic, and the initial characteristic is the "slapped face" appearance.
B. A discrete pinkish red maculopapular rash that is spreading to the trunk.
Explanation: While erythema infectiosum can involve a discrete rose-pink maculopapular rash on the trunk and limbs, the key initial characteristic is the "slapped face" appearance.
C. An erythema on the face that has a "slapped face appearance."
Explanation:
Erythema infectiosum, caused by the parvovirus B19, is commonly known as fifth disease. The initial rash often presents with a distinctive "slapped face" appearance, characterized by erythema (redness) on the cheeks, resembling a slapped appearance. Subsequently, a discrete rose-pink maculopapular rash may develop on the trunk and limbs.
D. A discrete rose-pink maculopapular rash on the trunk.
Explanation: This description aligns with the later stages of the rash in erythema infectiosum. However, the initial characteristic is the "slapped face" appearance on the face.

Correct Answer is B
Explanation
A. "I will limit my child's fluid intake."
Incorrect: Limiting fluid intake is not typically recommended for children with CF. Maintaining hydration is important, especially since individuals with CF may have increased salt losses in sweat.
B. "We will give our child pancreatic enzymes with snacks and meals."
Correct Answer: This response indicates an understanding of the importance of giving pancreatic enzymes to assist with digestion, as individuals with CF often have pancreatic insufficiency. Pancreatic enzymes help in the absorption of nutrients from food.
C. "We will restrict the amount of salt in our child's food."
Incorrect: While it's true that individuals with CF may need to increase their salt intake due to increased salt losses in sweat, this response suggests restricting salt, which is not in line with the nutritional needs of a child with CF.
D. "I will prepare low-fat meals with limited protein for my child."
Incorrect: Children with CF often need a higher calorie intake, including healthy fats and adequate protein. Restricting fat and protein is not in line with the nutritional needs of a child with CF.
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