Final answer:
The nurse identified the risk of a congenital anomaly in the fetus by reviewing the patient's real-time ultrasonography. Ultrasound imaging is preferred for studying fetal growth and development due to its real-time visualization and detailed information about anatomy and physiology.
Step-by-step explanation:
The nurse was able to draw the conclusion of the fetus being at risk of a congenital anomaly by reviewing the laboratory reports of the patient's real-time ultrasonography. Ultrasound imaging is the technique of choice for studying fetal growth and development because it allows for the visualization of the fetus in real-time and provides detailed information about its anatomy and physiology. In this case, the nurse likely observed abnormalities or deviations from normal development in the ultrasound images, such as structural malformations or organ dysfunctions.