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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.
If a fetal structural anomaly is identified on. ultrasound examination, invasive prenatal diagnosis should be offered. A patient with. a positive test result should be referred for genetic counseling and offered invasive. prenatal diagnosis for confirmation of test results. A negative cell free fetal DNA test. result does not ensure an unaffected pregnancy.