![]() ![]() Results from the scan may be available on the same day of testing, and your doctor may discuss the findings with you before you leave. The ultrasound tech needs access to your lower abdomen, so make sure you wear comfortable clothing that makes it accessible. 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. During the scan, you’ll lie down on an exam table as the technician moves an ultrasound wand over your stomach. ![]() In most cases, testing is completed in about 30 minutes. No special preparation is required for an NT scan. If you don’t combine blood testing with the scan, the accuracy rate drops to 75 percent. If you combine an NT scan with blood testing, the screening is about 85 percent accurate for predicting the risk of Down syndrome. They also can help assess your baby’s risk.Īs with any prediction, the accuracy rate varies. Talk to your doctor about available blood tests. They can then enter your age or date of birth in a computer program to calculate the risk of your baby having an abnormality.Īn NT scan cannot diagnose Down syndrome or any other chromosome abnormality. From this image, your doctor or technician measures the translucency, or clear space, at the back of your baby’s neck. You could alternatively have a transvaginal test, where an ultrasound probe is inserted through your vagina.Īn ultrasound uses high frequency sound waves to create an image from inside your body. Unfortunately, most babies born with these abnormalities die within the first year of life.ĭuring the screening, your doctor or a technician will take an abdominal ultrasound. Patau syndrome and Edwards syndrome are rare and often fatal chromosome abnormalities. It’s one of the most common genetic conditions. This condition affects 1 in every 700 babies born in the United States. Down syndrome, which can’t be cured, causes developmental delays and distinct physical characteristics. Individuals born with Down syndrome have an extra copy of chromosome 21. In most cases, the nucleus has 23 pairs of chromosomes, which are equally inherited from both parents. Our body cells have many parts, including a nucleus. But too much clear space can indicate Down syndrome, or might show another chromosome abnormality like Patau syndrome or Edwards syndrome. It’s not unusual for a fetus to have fluid or clear space at the back of their neck. This test measures the size of the clear tissue, called the nuchal translucency, at the back of your baby’s neck. An NT scan is a common screening test that occurs during the first trimester of pregnancy. ![]()
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