Leeds dating scan
General body diagnostic ultrasound imaging including Musculoskeletal, fertility monitoring facitlity and DNA genetic carrier screening.
That will happen at your next routine scan at about 20 weeks However, some major problems can be seen at your dating scan, such as issues with the umbilical cord or with your baby's skull or abdominal wall.
You may need a second scan to check the first scan's findings.
A blood test at what you thought was 13 weeks wouldn't be helpful if you were actually 16 weeks pregnant.
It may lead to you being given a high chance for Down's syndrome, when your baby is actually developing normally (false-positive result). Addition of non-invasive test to improve screening for pregnant women.
As long as the timings are right, you can have the NT scan and blood test at the same appointment as your dating scan. That's because the screening test needs an accurate due date to be reliable.