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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.
The ultrasound is called a nuchal translucency (NT) test and can be performed when you are between 11 to 14 weeks pregnant. This measures the fluid under the skin at the back of the baby's neck and can be used to determine your risk of having a baby with Down syndrome.