A woman who is trying to get pregnant tells the nurse that she was very disappointed several months ago when she was informed that her positive pregnancy test was a false positive. Which method of determining pregnancy provides the greatest degree of accuracy?
Visualization of implantation by vaginal ultrasound.
Maternal blood serum tests positive for alpha-fetoprotein.
Presence of amenorrhea for 2 months.
Reports feeling tired all of the time.
The Correct Answer is A
Choice A rationale
Visualization of implantation by vaginal ultrasound offers the highest accuracy in confirming pregnancy, as it directly visualizes the implanted embryo, eliminating errors associated with biochemical tests.
Choice B rationale
Maternal blood serum tests positive for alpha-fetoprotein do not confirm pregnancy. Alpha-fetoprotein is a marker used primarily for screening fetal abnormalities, not pregnancy determination.
Choice C rationale
The presence of amenorrhea for 2 months can suggest pregnancy but is not definitive due to other potential causes of missed periods, such as hormonal imbalances or stress, reducing its accuracy.
Choice D rationale
Reporting feeling tired all the time is a nonspecific symptom that can result from numerous conditions unrelated to pregnancy, making it an unreliable method for pregnancy determination.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
Hydralazine decreases blood pressure by vasodilation, improving renal perfusion and function. Enhanced kidney function promotes diuresis, balancing fluid levels and reducing hypertension.
Choice B rationale
While controlling blood pressure indirectly benefits liver health, hydralazine's primary effect on vasodilation does not directly support liver function.
Choice C rationale
Hydralazine primarily lowers blood pressure through vasodilation. Preventing arrhythmias is more directly associated with medications affecting cardiac conduction rather than vasodilators.
Choice D rationale
Lowering cholesterol levels is not a direct effect of hydralazine. Its primary action is reducing blood pressure through vascular smooth muscle relaxation, decreasing hypertension.
Correct Answer is A
Explanation
Choice A rationale
Passive immunity provided by maternal antibodies crossing the placenta and through breast milk protects newborns in the first months of life, offering initial defense against communicable diseases.
Choice B rationale
Antiinfectants effectiveness against microbes does not apply; newborns rely on passive immunity as their adaptive immune system matures, not unresistant antiinfectants.
Choice C rationale
Active immunity develops over several months to years in newborns, as their immune system gradually encounters pathogens and develops specific responses.
Choice D rationale
While neutrophils are part of the innate immune system, they may still be immature and insufficient in preventing infections in neonates without maternal antibody support.
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