The parents of a child with sickle cell anemia do not have the disease and are inquiring about the risk of sickle cell disease in future offspring. The nurse practitioner should explain that with each future pregnancy, there is a:
25% chance of the child having the sickle cell trait.
25% chance of the child having sickle cell anemia.
50% chance of the child not having sickle cell disease or the trait for the disease.
50% chance of the child having sickle cell anemia.
The Correct Answer is B
Rationale:
A. A 25% chance of having the sickle cell trait occurs when both parents are carriers (heterozygous), not when they are unaffected.
B. If both parents are carriers (sickle cell trait, AS), each pregnancy carries a 25% chance that the child will inherit sickle cell disease (homozygous SS).
C. Each child also has a 25% chance of inheriting two normal alleles (AA) and being unaffected, but this does not equal 50%.
D. A 50% chance of having sickle cell anemia is incorrect; the risk is 25% per pregnancy for two carrier parents.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Rationale:
A. Testing 1–2 weeks after starting therapy is premature, as the full course of antibiotics has not yet been completed, and results may not accurately reflect treatment effectiveness.
B. One week after completion of nitrofurantoin therapy is recommended to assess the resolution of bacteriuria and confirm the effectiveness of treatment for acute cystitis in pregnant adolescents. This timing allows any remaining bacteria to be detected while minimizing false negatives.
C. Testing after 10 days of therapy initiation may still be during treatment, which is too early to confirm eradication.
D. Waiting 2 weeks after completion of therapy is not necessary; 1 week post-treatment is sufficient to evaluate effectiveness and ensure prompt follow-up.
Correct Answer is D
Explanation
Rationale:
A. Hypoxia may cause some stress responses but is not the most common cause of temperature instability in a newborn.
B. Congenital heart disease can affect perfusion but typically does not directly cause temperature instability.
C. Polycythemia may affect circulation but is not a primary cause of abnormal temperature regulation.
D. Sepsis is a common cause of temperature instability in newborns, manifesting as hypothermia or hyperthermia. Newborns have immature thermoregulatory systems, and infections can easily disrupt temperature homeostasis, making temperature instability an important early sign of neonatal sepsis.
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