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.
There are differences between screening and diagnostic testing.
Screenings also can monitor your baby-to-be’s health, and help identify chromosomal abnormalities.
Pregnancy screenings take place during the first, second, and third trimesters.
This test examines fetal DNA in your bloodstream to assess your baby's risk for Down syndrome and other chromosome abnormalities.
It can be frightening to receive inconclusive or positive results from an NT scan.
Diagnostic testing, on the other hand, confirms the presence of a disease or condition.
To diagnosis a chromosome abnormality, ask your doctor about diagnostic testing.An ultrasound uses high frequency sound waves to create an image from inside your body. If you combine an NT scan with blood testing, the screening is about 85 percent accurate for predicting the risk of Down syndrome.From this image, your doctor or technician measures the translucency, or clear space, at the back of your baby’s neck. If you don’t combine blood testing with the scan, the accuracy rate drops to 75 percent. In most cases, testing is completed in about 30 minutes.They can then enter your age or date of birth in a computer program to calculate the risk of your baby having an abnormality. During the scan, you’ll lie down on an exam table as the technician moves an ultrasound wand over your stomach.An NT scan cannot diagnose Down syndrome or any other chromosome abnormality. The ultrasound pictures may be easier to read if you have a full bladder, so your doctor may recommend drinking water about one hour before your appointment.The ultrasound tech needs access to your lower abdomen, so make sure you wear comfortable clothing that makes it accessible.