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 ["260"]
Explanation
To calculate the total fluid intake, add the volumes of each item consumed:
Juice: ½ cup
1 cup = 240 mL
½ cup = 240 mL / 2 = 120 mL
Gelatin: 3 oz
1 oz ≈ 30 mL
3 oz = 3 * 30 mL = 90 mL
Ice pop: 1 oz
1 oz ≈ 30 mL
1 oz = 30 mL
Ginger ale: 20 mL
Now, add these values:
120 mL (juice) + 90 mL (gelatin) + 30 mL (ice pop) + 20 mL (ginger ale) = 260 mL
Therefore, the nurse should record 260 mL as the child's fluid intake.
Correct Answer is D
Explanation
A. Diarrhea
Explanation: Diarrhea is not a typical sign of Hirschsprung's disease. Instead, the condition is associated with constipation due to the obstructed passage of stool.
B. Regurgitation of feedings
Explanation: Regurgitation of feedings is not a characteristic sign of Hirschsprung's disease. It may be seen in other gastrointestinal conditions, but not specifically in this disorder.
C. Projectile vomiting
Explanation: Projectile vomiting is not a typical sign of Hirschsprung's disease. It may be associated with conditions such as pyloric stenosis, but it is not a characteristic feature of Hirschsprung's disease.
D. Foul-smelling ribbon-like stools
Explanation:
Hirschsprung's disease is a congenital condition characterized by the absence of ganglion cells in the rectum and a portion of the colon. The lack of ganglion cells results in functional obstruction, causing stool to accumulate in the affected area. One of the hallmark signs is the presence of foul-smelling, ribbon-like stools, often described as "fecal pellets" or "pellets" due to the obstructed passage of stool.
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