A nurse is teaching routine prenatal care to a group of clients who are pregnant. Which of the following statements by a client indicates an understanding of the teaching?

Choice A rationale Fetal cardiac activity is typically detectable via transvaginal ultrasound as early as 5.5 to 6 weeks gestational age, when the embryo is approximately 2-4 mm in crown-rump length. However, hearing the heartbeat with a Doppler stethoscope usually occurs later, around 10 to 12 weeks, as the fetal heart is still very small and sound transmission is limited. Choice B rationale The standard schedule for prenatal visits involves monthly appointments from the first prenatal visit until 28 weeks of gestation. This frequency allows for consistent monitoring of maternal and fetal well-being, early detection of potential complications, and timely interventions. After 28 weeks, visits typically become more frequent. Choice C rationale While a complete blood count (CBC) is a crucial laboratory test performed during pregnancy, it is not typically done at every prenatal visit. Initial CBCs are obtained at the first prenatal visit to establish baseline values, and then repeated later in pregnancy, often around 28 weeks, to screen for anemia and other hematologic changes. Choice D rationale Screening for neural tube defects, often through maternal serum alpha-fetoprotein (MSAFP) testing, is typically performed between 15 and 20 weeks of gestation. This timing is crucial for accurate interpretation of results and allows for further diagnostic evaluation if abnormalities are detected, well before 32 weeks.