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 A
Explanation
A. Heat intolerance
Explanation:
Graves' disease is an autoimmune disorder that results in hyperthyroidism, meaning there is an overproduction of thyroid hormones. Common symptoms of Graves' disease include heat intolerance, increased sweating, weight loss, palpitations, and anxiety. The hyperactivity of the thyroid gland leads to an increased metabolic rate, causing heat intolerance.
B. Bradycardia
Explanation: Bradycardia (slow heart rate) is not typically associated with Graves' disease. Hyperthyroidism usually leads to an increased heart rate (tachycardia) due to the stimulatory effects of thyroid hormones on the cardiovascular system.
C. Lethargy
Explanation: Lethargy (excessive tiredness or lack of energy) is more commonly associated with hypothyroidism, where there is an insufficient production of thyroid hormones. In Graves' disease, the excess thyroid hormones often lead to symptoms of hyperactivity, not lethargy.
D. Weight gain
Explanation: Weight gain is not a typical finding in Graves' disease. Hyperthyroidism often leads to unintentional weight loss due to increased metabolism and energy expenditure. Weight gain is more commonly associated with hypothyroidism.
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