A nurse is preparing a client who is at 10 weeks of gestation for an ultrasound procedure. Which of the following statements should the nurse make?

Choice A rationale At 10 weeks of gestation, the external genitalia of the fetus are not yet fully differentiated or large enough to be reliably visualized and identified as male or female on an ultrasound. Fetal sex determination is typically more accurate later in pregnancy, usually after 16-20 weeks, when anatomical structures are more developed and distinct. Choice B rationale While some major structural congenital anomalies might be detectable at 10 weeks, a comprehensive and detailed assessment for a wide range of congenital anomalies is usually performed during the anomaly scan, which is typically conducted between 18 and 22 weeks of gestation. Fetal development is still ongoing at 10 weeks. Choice C rationale An ultrasound performed in the first trimester, particularly around 10 weeks, is highly accurate for estimating gestational age and, consequently, the expected delivery date. This is because fetal growth is very consistent during this period, allowing for precise measurements such as crown-rump length to determine gestational age within a small margin of error. Choice D rationale Assessment of amniotic fluid volume, often quantified using the amniotic fluid index (AFI) or deepest vertical pocket, is more commonly performed in the second and third trimesters of pregnancy. At 10 weeks, the amniotic fluid volume is relatively small, and its adequacy is not typically a primary focus of an early ultrasound unless there are specific concerns.