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The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test".
It involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.
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You may need to have a full bladder for this scan, as this makes the ultrasound image clearer.
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It will usually take place at your local hospital ultrasound department.
The person performing the scan is called a sonographer.
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