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Medical ultrasound (also known as diagnostic sonography or ultrasonography) is a diagnostic imaging technique based on the application of ultrasound. It is used to see internal body structures such as tendons, muscles, joints,blood vessels and internal organs. Its aim is often to find a source of a disease or to exclude any pathology.
First trimester ultrasound examination is done to evaluate the presence, size, number and location of the pregnancy. Ultrasound can also be used for first-trimester sonographic genetic screening, as well as screening for any abnormalities of your uterus or cervix. If your health care provider suspects a multiple pregnancy, an ultrasound might be done to confirm the number of babies. 2  Evaluate your baby's growth. 3  Your health care provider can use ultrasound to determine whether your baby is growing at a normal rate.