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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.
An NT scan can't tell you for certain whether or not your baby is affected. What it can do is help you to decide whether or not to have a diagnostic test. This ultrasound scan must take place at between 11 weeks and 13 weeks plus six days of pregnancy, or when your baby is between 45mm and 84mm.t can be measured using ultrasound : All babies have some fluid at the back of their neck. But many babies with Down syndrome have an increased amount (Snijders et al 1998: 351, 343-6) . A nuchal translucency (NT) scan is a screening test that assesses whether or not your baby is likely to have Down syndrome.