Is fasting required for a uterine ultrasound?

B-mode ultrasound (B-ultrasound) is a type of ultrasound examination and is a non-invasive diagnostic procedure. So, is fasting required before undergoing a uterine B-ultrasound?

Is fasting required before a uterine B-ultrasound?

Fasting is not required for a uterine B-ultrasound. The uterus is one of the most important organs in the pelvic cavity. Pelvic ultrasound enables assessment of uterine abnormalities, such as endometrial polyps, uterine fibroids, adenomyosis, and uterine septum. Currently, there are two types of pelvic ultrasound: transabdominal ultrasound—requiring a full bladder—and transvaginal or transrectal endocavitary ultrasound. For married or sexually active women, transvaginal ultrasound may be selected when clinically indicated. Women who have never been sexually active typically undergo transrectal ultrasound instead. Compared with transabdominal ultrasound, endocavitary ultrasound offers greater convenience, speed, and image clarity.

Uterine B-ultrasound can detect various gynecological conditions—for example, salpingitis, endometritis, pelvic inflammatory disease (PID), adnexitis, and infections involving the ovaries and uterus. However, tubal obstruction may not be reliably detected by routine B-ultrasound. To diagnose fallopian tube blockage, hysterosalpingography (HSG) or tubal perfusion testing is required. Some gynecological conditions necessitate additional diagnostic procedures, such as hysteroscopy or colposcopy, blood tests, or analysis of vaginal discharge and mucosal samples.

Prior to a transabdominal B-ultrasound, it is advisable to drink plenty of water to ensure bladder distension, which improves visualization of the uterus, adnexa, and pelvic structures. In contrast, no bladder filling is required for transvaginal ultrasound. We hope this information is helpful to you. Wishing you good health and happiness!