CAMRT Radiography Practice Exam

Which type of contrast medium is preferred for hysterosalpingography?

1. Barium sulfate

2. CO2

3. Oily viscous

4. Water-soluble

The correct answer is: Water-soluble

In hysterosalpingography (HSG), the preferred type of contrast medium is a water-soluble option. This is primarily because water-soluble contrast agents, such as iodinated contrast media, are specifically formulated to be easily absorbed and eliminated by the body. This characteristic minimizes discomfort for the patient and reduces the risk of complications that can arise from using other types of contrast agents. Water-soluble contrast agents also provide clear imaging of the uterine cavity and fallopian tubes, which is crucial for diagnosing any anomalies or blockages present in these structures. They are less likely to cause allergic reactions compared to other contrast agents, and in the event of extravasation, they can be absorbed by surrounding tissues, thus mitigating the potential for complications. In comparison, barium sulfate is not suitable for HSG as it is primarily designed for gastrointestinal studies. It can lead to complications if introduced into the reproductive tract. Similarly, CO2, while useful as a negative contrast agent in some imaging scenarios, does not provide the necessary visualization required for hysterosalpingography. Oily viscous agents, on the other hand, can also lead to complications such as inflammation or foreign body reactions and are not typically recommended for this type of examination.