Ultrasound, also called sonography, is a diagnostic imaging method that uses high-frequency sound waves to create images of the organs, soft tissues, blood vessels, blood flow, and structures within the body. A sonogram is the image created by the ultrasound.
A color Doppler ultrasound may be utilized to visualize blood flow in the heart, blood vessels, and umbilical cord. During pregnancy, most ultrasounds are conducted using a sensor wand, called a transducer, on the surface of the skin. In some circumstances, a transvaginal ultrasound, in which the transducer wand is inserted into the vagina, may be required.