|You are here > Home > Services > Nuchal Scan|
What is a Nuchal Scan?
The nuchal scan on its own will detect approximately 80% of babies with chromosomal abnormalities such as Down’s syndrome (Trisomy 21), Patau’s Syndrome (Trisomy 13) and Edward’s Syndrome (Trisomy 18). It will also show up major structural abnormalities which can be visible at this early stage. The Nuchal Scan is not a substitute for a normal Fetal Anomoly Scan usually carried out at 20-22 weeks. The detection rate for chromosomal abnormalities can be improved slightly by measuring hormone levels from a blood test. The combined or integrated test (Nuchal and Blood) as it is known has a detection rate of approximately 90%. Many couples are happy with the Nuchal Scan on its own, but if you would like a blood test taken please let us know. We will package the sample and then you will need to send it by guaranteed next day special delivery to the Fetal Medicine Foundation in London. They will carry out the analysis (cost - £35) and will send the results back to Glen House and we will then add the hormone results with the nuchal data and generate a complete report for you at that stage.
At your Appointment
What is my Background Risk?
The backgroundrisk is assessed purely on the mother’s age, eg for a 30 year old the risk is 1 in 626. That means in every 626 pregnant 30 year olds, one will have a baby with Down’s syndrome.
What Does Adjusted Risk Factor Mean?
The adjusted risk factor is usually better than the background factor.
Example: If you are 30 years old then your ‘background’ risk of having a baby with Down’s Syndrome is 1 in 626. Assuming the Nuchal skin thickness is thin at 1.6 mm, then the final ‘adjusted’ risk is reduced to 1 in 2267. Background risk is 1 in 626 adjusted to 1 in 2267.
Please do not hesitate to ‘phone to speak to the Ultrasonographers if you have any queries about your result, or want to arrange an amniocentesis.
If nuchal translucency is performed a Triple Test is not necessary and will provide no further information.
©2003 - 2011 Dr Paul Fogarty