The NT Scan is the most important, time-sensitive screening in your first trimester. This non-invasive ultrasound (USG) precisely measures the 'Nuchal Translucency' (fluid at the back of the baby's neck) and confirms the presence of the 'Nasal Bone'. These two markers are a powerful, early screening tool for assessing the risk of chromosomal conditions like Down syndrome. This is a routine, safe, and empowering check-up, providing you and your doctor with the first, critical insights into your baby's health.