Nuchal scan vs dating scan
During the screening, your doctor or a technician will take an abdominal ultrasound.You could alternatively have a transvaginal test, where an ultrasound probe is inserted through your vagina.The first trimester screening is a type of prenatal testing that provides your doctor with early information about your baby’s health — namely your baby’s risk for chromosome abnormalities.
There’s a small risk of miscarriage with both tests.
An NT scan is a safe, noninvasive test that doesn’t cause any harm to you or your baby.
This test measures the size of the clear tissue, called the nuchal translucency, at the back of your baby's neck.
It’s not unusual for a fetus to have fluid or clear space at the back of their neck.
Keep in mind that this first trimester screening is recommended, but it’s optional.