Down syndrome is a chromosomal disorder affecting 1 in 1, babies. Screening tests for Down syndrome are routinely offered to pregnant women. Questions to ask your doctor about the tests and scans you will be offered during your pregnancy.
Read more on Better Health Channel website. A dating scan is an ultrasound scan to determine how many weeks pregnant you are and your due date. Learn more about how the procedure is performed. In the second trimester of pregnancy, you may be offered to have an morphology scan anomaly scan. Learn about what it looks for and when it is performed. Pregnancy, Birth and Baby is not responsible for the content and advertising on the external website you are now entering.
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Your name: is required Error: This is required. You could alternatively have a transvaginal test, where an ultrasound probe is inserted through your vagina. An ultrasound uses high frequency sound waves to create an image from inside your body. They can then enter your age or date of birth in a computer program to calculate the risk of your baby having an abnormality.
An NT scan cannot diagnose Down syndrome or any other chromosome abnormality. The test only predicts the risk. Talk to your doctor about available blood tests.
As with any prediction, the accuracy rate varies. If you combine an NT scan with blood testing, the screening is about 85 percent accurate for predicting the risk of Down syndrome. No special preparation is required for an NT scan. In most cases, testing is completed in about 30 minutes. 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. 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. In other words, 5 percent of women tested receive positive results, but the baby is fine.
After a positive result, your doctor may suggest another blood test called prenatal cell-free DNA screening. It can be frightening to receive inconclusive or positive results from an NT scan. An NT scan is a screening test, not a diagnostic test. There are differences between screening and diagnostic testing.
The purpose of a screening test is to identify risk factors for a particular disease or condition. 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. Options include an amniocentesis, which is when a needle is inserted through your stomach into the amniotic sac to retrieve a fluid sample.
Amniotic fluid contains cells that provide genetic information about your baby. If you think you will find this difficult, please talk to us at the time of booking. You are not permitted to take photos or video during the scan. This is a medical procedure, and whilst we appreciate you are excited, the health of your baby is our primary concern and we ask for your support and understanding during this clinical appointment.
Due to the medical nature of the appointment we ask that you are accompanied by one person. Your Ultrasound will be performed by a Sonographer. They are specially trained medical professionals who perform ultrasounds.
The images the Sonographer captures are then reviewed by a Radiologist who will generate a report for your referring doctor.
You will be asked to lie down on a bed and your abdomen will need to be visible. The Sonographer will do their best to protect your clothing as they apply a warmed gel to your abdomen. To ensure we capture all the images the Doctor needs, the Sonographer may take up to an hour to complete the scan.
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