NT Scan or Nuchal Translucency screening is nothing but an ultrasound test. Though any pregnant woman can be advised to go through this test but the main utility of this test lies in the cases involving older expecting mothers who cannot undergo other invasive medical tests such as CVS and amniocentesis due to the increased risk of miscarriage associated with them. The other set of people on whom this test is performed are with the abnormal family medical history with chromosomal disorders or any kind of problems faced with prior pregnancies. The test is used to detect the heart defects (congenital), down syndrome and other forms of chromosomal disorders that are the result of additional copies of chromosomes.

The nuchal translucency scan is done between 11 and 14 weeks of pregnancy. It might need to be done alone, or it might be able to be done while you're having your dating scan. Usually the scan is done through your abdomen but occasionally the nuchal translucency can only be seen by inserting a probe into the vagina.