List three clinical precautions that should be taken with regard to an HSG.

1. Perform only in nonpregnant women on days 6 to 12 after the patient's LMP.
2. HSG should not be performed in cases of an active or recent pelvic infection.
3. Administer prophylactic antibiotics if tubal inflammation is observed (to reduce the risk of infection and a tuboovarian abscess).