Transvaginal ultrasound is a imaging technique used to create a picture of the genital tract in women. The hand-held device that produces the ultrasound waves is inserted directly into the vagina, close to the pelvic structures, thus often producing a clearer and less distorted image than obtained through transabdominal ultrasound technology, where the probe is located externally on the skin of the abdomen. A ultrasound, or sonogram, is a procedure that utilizes reflected sound waves to produce a picture of organs and structures within the body. A transducer sends out high-pitched sounds, sounds that are above the range of human hearing, that are reflected back to the transducer. A computer is used to analyze the sound waves, transforming them into a picture (which is called a sonogram, echogram, or ultrasound scan) on a video monitor. These pictures can be saved as a permanent record of the test. A transvaginal ultrasound is used for looking at organs and structures within the pelvic area that are solid and uniform, like the uterus, and ovaries, or for organs that are fluid-filled, like the bladder. Mineralized structures, like bones, or air-filled organs, such as the intestines, do not show up well on a sonogram and may disrupt the ultrasound beam so that deeper organs and structures cannot be seen clearly. The transvaginal transducer that produces the ultrasound waves is shaped to fit within a woman's vagina. It is lubricated and covered with a sheath such as a condom. A woman should tell the health care provider if she is allergic to latex so that a latex-free cover can be applied to the transducer before it is inserted into the vagina.

Sometimes a woman may have both transvaginal and transabdominal ultrasound scans done to obtain a complete evaluation of the pelvic area. There is no special preparation required by a woman before a transvaginal ultrasound. She can continue to take medications prescribed by her health care provider, although she should not drink liquids for four hours before the test. A full bladder is not required for a transvaginal ultrasound, as is required for a transabdominal ultrasound. The test can be administered during any stage of the woman's menstrual cycle. During the procedure, the woman lies on her back, with her hips slightly raised. The thin, lubricated tip of the transducer is inserted gently into the vagina. The transducer is moved and rotated to adjust the view of the pelvic structures displayed on the monitor. The woman must lie very still during the ultrasound scan. She may feel a mild discomfort from the pressure of the vaginal transducer. The procedure usually takes from 15 to 30 minutes. Occasionally, hysterosonography is done on a nonpregnant woman to evaluate the inside of the uterus (endometrial cavity) and fallopian tubes by filling the uterus with fluid during a transvaginal ultrasound.

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