The nurse practitioner instructs the pregnant adolescent that several diagnostic tests will be performed during prenatal visits. She should return for serum alpha-fetoprotein (AFP) around:
8-14 weeks' gestation.
10-15 weeks' gestation.
16-18 weeks' gestation.
20-24 weeks' gestation.
The Correct Answer is C
Rationale:
A. 8–14 weeks is typically when first-trimester screening (nuchal translucency and serum markers like PAPP-A and free β-hCG) is performed, not AFP.
B. 10–15 weeks is not the standard window for serum AFP testing.
C. 16–18 weeks’ gestation is the recommended time for maternal serum alpha-fetoprotein (AFP) testing, which is part of the quad screen to assess risk for neural tube defects and certain chromosomal abnormalities.
D. 20–24 weeks is beyond the optimal window for AFP screening; levels may no longer provide accurate risk assessment for neural tube defects.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
Rationale:
A. A micropenis and jitterness are more characteristic of congenital hypopituitarism or other endocrine disorders, not primary congenital hypothyroidism.
B. Vomiting, lethargy, and poor feeding are nonspecific and could indicate many neonatal conditions but do not specifically point to congenital hypothyroidism.
C. Decreased activity, a large anterior fontanel, and poor feeding are classic signs of congenital hypothyroidism. Infants may also present with hypotonia, prolonged jaundice, constipation, and a hoarse cry. Early detection is critical to prevent growth retardation and intellectual disability.
D. Rapid heart rate, irritability, and frequent stools are more suggestive of hyperthyroidism or other metabolic conditions, not hypothyroidism.
Correct Answer is A
Explanation
Rationale:
A. In a healthy 10-year-old, a heart rate of 60 beats per minute at rest is concerning because the normal resting heart rate for this age group ranges from approximately 70–120 bpm. A heart rate below 70 bpm (bradycardia) may indicate an underlying cardiac conduction issue or other pathology, particularly if symptomatic.
B. 73 bpm is within the normal range for a 10-year-old at rest.
C. 100 bpm is normal and can be expected depending on activity, anxiety, or mild stress.
D. 120 bpm is at the upper limit of normal for a 10-year-old and may be appropriate depending on recent activity or emotional state.
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