FNP Prenatal Care Practice Questions

Women in their late forties can still ovulate unpredictably and conceive. Given that this 48-year-old female has missed her last two menstrual periods and uses condoms inconsistently, pregnancy must be definitively ruled out before attributing her symptoms to the menopausal transition. Option A is unsafe because it ignores the significant risk of an unintended pregnancy. Option B is unnecessary and is not the primary diagnostic step for missed periods in this context. Option D is contraindicated if the patient is pregnant, making a human chorionic gonadotropin test the essential first diagnostic action to ensure patient safety.

The pharmacokinetic changes of pregnancy, including increased glomerular filtration rate and expanded volume of distribution, reverse rapidly after delivery. Because this patient's levetiracetam dose was significantly increased during pregnancy, failing to implement an immediate dose reduction exposes her to severe postpartum drug toxicity. The dose should be reduced toward the pre-pregnancy baseline within the first few days postpartum. Option A is incorrect because maintaining the high dose will cause toxicity as her renal clearance normalizes. Option B is incorrect because an eight-week taper is too slow to match the rapid physiological shifts occurring in the immediate postpartum period. Option D is incorrect because abruptly discontinuing an antiepileptic drug will likely precipitate withdrawal seizures, endangering the patient.

Pregnancy hormones cause a peak in morning insulin resistance, making high-carbohydrate meals like cereal and milk likely to cause postprandial spikes above the 140 mg/dL 1-hour target. The most appropriate first step is dietary modification, specifically swapping the carbohydrates for a protein-rich alternative. Increasing evening metformin or adding bedtime long-acting insulin targets fasting glucose, which is already normal in this patient. Decreasing glucose checks is inappropriate when the patient is actively experiencing uncontrolled postprandial hyperglycemia.

Nutritional planning during pregnancy relies heavily on pre-pregnancy body mass index to optimize maternal and fetal outcomes. For a patient with a BMI of 32, which falls into the obese category, the Institute of Medicine recommends a total weight gain of 11 to 20 pounds. Option A describes the recommendation for a normal BMI (18.5 to 24.9). Option B is the target for an overweight BMI (25 to 29.9). Option C is the target for an underweight BMI (less than 18.5). Adhering to the 11 to 20 pounds guideline minimizes risks like gestational diabetes and macrosomia.

Pregnancy causes a significant increase in total body water and plasma volume, which directly increases the volume of distribution for many medications, particularly hydrophilic drugs. This expanded volume dilutes the medication, lowering peak serum concentrations and often requiring higher daily doses to maintain therapeutic efficacy. Option A is incorrect because the volume of distribution increases, not decreases, during pregnancy. Option B is incorrect because pregnancy typically decreases plasma protein binding due to a dilutional drop in serum albumin, rather than increasing it. Option C is incorrect because renal clearance generally increases during pregnancy due to enhanced renal blood flow and glomerular filtration, which would also contribute to the need for higher, not lower, daily doses.

Pregnant women with subclinical hypothyroidism and positive TPO antibodies are at high risk for progressing to overt hypothyroidism due to the increased metabolic demands of pregnancy overwhelming the compromised thyroid gland. This progression threatens fetal development and maternal health. Option A is incorrect because maternal TPO antibodies do not destroy the fetal thyroid; TSH-receptor antibodies in Graves' disease can affect the fetus, but not TPO. Option B is incorrect as TPO antibodies are associated with Hashimoto's and hypothyroidism, not thyrotoxicosis. Option C is incorrect because TPO antibodies are not a recognized direct cause of peripartum cardiomyopathy.

Divalproex sodium is a known teratogen carrying a high risk of neural tube defects and cognitive impairment. It should be discontinued prior to conception. Lamotrigine is a preferred, safer mood stabilizer for bipolar disorder during pregnancy. Maintaining the current drug, even with high-dose folic acid, still poses an unacceptable teratogenic risk. Carbamazepine is also teratogenic and associated with fetal malformations. Reducing the dose does not eliminate the severe risk to the developing fetus.

The USPSTF recommends screening for prediabetes and type 2 diabetes in adults aged 35 to 70 who have overweight or obesity. Since this patient is 36 with a BMI of 26, he meets the criteria for immediate screening. Ordering a fasting plasma glucose or A1c is the standard initial step. Delaying until age 45 is outdated, as guidelines recently lowered the age to 35. Recommending lifestyle changes without screening misses the opportunity to establish a baseline diagnosis. An oral glucose tolerance test is generally reserved for pregnancy or equivocal results, not initial routine screening in this population.

Finasteride is a 5-alpha reductase inhibitor that is highly teratogenic to male fetuses. Pregnant women must absolutely avoid handling crushed or broken finasteride tablets due to the severe risk of cutaneous absorption. Wearing gloves provides insufficient protection against this severe risk and is not considered safe practice. Transitioning to an alpha-blocker or another 5-ARI does not directly address the core safety issue of the pregnant wife handling the currently prescribed teratogenic medication.

The combination of an empty uterus on ultrasound and an hCG level above the discriminatory zone (typically 1,500 to 2,000 mIU/mL) makes an ectopic pregnancy the primary diagnosis until proven otherwise. A threatened abortion would typically show an intrauterine gestational sac at this high hCG level. An incomplete pregnancy loss might present with an empty uterus, but the hCG would generally be falling, and the pain is usually midline cramping rather than unilateral. A hemorrhagic ovarian cyst could cause unilateral pain, but it does not account for the elevated hCG level without a visible intrauterine pregnancy. Therefore, the clinical picture strongly points to an extrauterine implantation.