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All pregnant women are offered an ultrasound scan at around 8-14 weeks of pregnancy. It's used to see how far along in your pregnancy you are and check your baby's development.

Your midwife or doctor will book you a dating scan appointment.

Screening for Down's syndrome will happen at the dating scan if: The screening test for Down's syndrome used at this stage of pregnancy is called the combined test.

The combined test involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.

A device (called a transducer) is applied to your skin, sending high-frequency sound waves into your body that reflect back off internal structures.

The echoes are received by the transducer and transformed into a picture on the screen.

This test is not quite as accurate as the combined test.