You do not need to abstain from sex before having a vaginal ultrasound, it is possible to have sex.
Vaginal ultrasound is performed with an ultrasound probe that is placed in the vagina to find out if there are any abnormal masses and other lesions in the uterus, adnexa and other organs, and the results of vaginal ultrasound will not be affected after sex, so there is no need for abstinence.
Meanwhile, for women who have had sex, it is recommended that they undergo vaginal ultrasound because vaginal ultrasound avoids the interference of abdominal fat and the vaginal probe is closer to the uterus and adnexa, so the results of the examination are more accurate and can detect small lesions.
In addition, transvaginal ultrasound is best avoided during menstruation, but if sinus follicle assessment is required it needs to be performed the day after menstrual bleeding and needs to be strictly sterilized to avoid the possibility of infection.