Ultrasound or Ultrasonography (USG) Level I – NT (Nuchal Translucency) scan is performed during the 11th to 14th month of the pregnancy. NT is the sonographic appearance of a collection of fluid under the skin behind the fetal neck in the first-trimester of pregnancy.

NT Scan (Nuchal Translucency Scan): The NT scan is a prenatal screening procedure typically performed between the 11th and 14th weeks of pregnancy. It involves measuring the thickness of the nuchal translucency, a small fluid-filled space at the back of the baby’s neck. An increased thickness could be associated with certain chromosomal abnormalities.

NB Scan (Nasal Bone Scan): This scan is sometimes done in conjunction with the NT scan. The presence or absence of the nasal bone in the fetus is assessed, and this information can be used as an additional marker for chromosomal abnormalities.

For a twin pregnancy, these scans may be particularly important as there can be different considerations and potential risks compared to a singleton pregnancy. The scans help in assessing the health and development of each twin, checking for any abnormalities, and providing information for the management of the pregnancy.

The terminology may vary by region and healthcare provider, so it’s essential to communicate directly with your healthcare professional to understand the specific details of the scans they are recommending or performing in your case. They can provide you with accurate and personalized information based on your medical history and the details of your pregnancy.