What should a nurse inform a pregnant client about the transabdominal ultrasound procedure?

Drinking fluids before a transabdominal ultrasound is important because a full bladder helps improve the clarity of the images captured during the procedure. When the bladder is full, it provides a better acoustic window, allowing the sound waves to travel more effectively, which enhances the visualization of the uterus and the fetus. This preparation is a common practice to ensure accurate results for both the healthcare provider and the patient.

The other options relate to aspects of the procedure but do not reflect the standard practices for transabdominal ultrasounds. For instance, a probe would not be inserted into the vagina, as this describes a transvaginal ultrasound instead. While the patient is indeed often positioned on her back during the procedure, this is a typical position and not something that necessarily needs to be emphasized in the context of preparation. The duration of the procedure is generally much shorter than two hours, often taking only about 20 to 45 minutes, making the other option regarding time also inaccurate. Thus, informing the client about the need to drink fluids is the most relevant and accurate preparation step for a transabdominal ultrasound.