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At the scan, the fluid at the back of the baby's neck is measured to determine the "nuchal translucency".
Your age and the information from these two tests is used to work out the chance of the baby having Down's, Edwards' or Patau's syndromes.
For example, you may be offered diagnostic tests that can tell you for certain whether the baby has these conditions, but these tests have a risk of miscarriage.
You can choose to have screening for: If you choose not to have the screening test for Down's, Edwards' or Patau's syndromes, you can still choose to have other tests, such as a dating scan.
If it wasn't possible to obtain a nuchal translucency measurement, or you're more than 14 weeks into your pregnancy, you'll be offered a test called the quadruple blood screening test between 14 and 20 weeks of pregnancy.