A nurse is preparing to administer digoxin to a 6-month-old infant. Prior to administering the dose, the nurse measures the apical heart rate. The nurse should withhold the dose if the infant's apical heart rate is less than what rate?

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.

A. Bottle-feed with diluted fruit juice:
Incorrect: Diluted fruit juice is not recommended for infants with diarrhea. Fruit juices, even when diluted, may contain sugars that can exacerbate diarrhea. It's important to focus on water or rehydration solutions.
B. Discontinue breast-feeding until the diarrhea resolves:
Incorrect: Breast milk is an essential source of nutrition for infants, and discontinuing breastfeeding is not recommended, even during episodes of mild diarrhea. Breast milk helps maintain hydration and provides essential nutrients.
C. Provide an increased intake of water.
Correct Answer: Maintaining hydration is crucial during episodes of diarrhea. Offering the infant increased water intake helps prevent dehydration. Rehydration solutions specifically designed for infants can also be recommended.
D. Avoid all solid foods:
Incorrect: While avoiding certain solid foods may be recommended in some cases, it's not necessary to completely avoid all solid foods for a 12-month-old with mild diarrhea. The emphasis should be on maintaining hydration and offering easily digestible foods.