What is a nuchal translucency (NT) ultrasound?
A nuchal translucency (NT) ultrasound measures a fluid-filled space at the back of your babys neck. The NT scan is done between 11 and just under 14 weeks of pregnancy. NT ultrasound is one part of an Integrated Prenatal Screening (IPS), involving two blood tests. The combination of the NT ultrasound and the two blood tests tell you the chance of your baby having Down syndrome, trisomy 18 or an open neural tube defect. Your health care provider will have your screen result within ten days after the second blood test. NT ultrasound alone may also be done in women carrying more triplets or more. How is an NT ultrasound done? The main part of an NT ultrasound involves an ultrasound scan. To accurately date your pregnancy, the sonographer will measure your baby from the top of its head to the bottom of the spine (called a Crown Rump Length (CRL) measurement). The sonographer will then measure the width of the fluid-filled space at the back of the baby’s neck. The skin will appear as a whit