Final answer:
A sonohysterogram would require surgical asepsis to be practiced as it involves entering a sterile body cavity through the cervix to visualize the uterus. This procedure needs a sterile field to prevent infections.
Step-by-step explanation:
Among the exams listed, a sonohysterogram would require surgical asepsis. This procedure involves the introduction of fluid into the uterine cavity through the cervix to visualize the inside of the uterus by ultrasound. Because it involves entering a sterile body cavity, it is crucial to prevent infection by practicing surgical asepsis, which means maintaining a sterile environment to prevent the introduction of microbes. Transvaginal exams, transabdominal exams, and infertility scans do not typically require a surgical sterile field, but standard aseptic techniques are still utilized to ensure cleanliness and minimize infection risk.