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You may need to have a full bladder for this scan, as this makes the ultrasound image clearer.You can ask your midwife or doctor before the scan if this is the case. Find out more about what happens during a pregnancy ultrasound scan.This is sometimes called a nuchal translucency scan.The nuchal translucency measurement can be taken during the dating scan.Geoffrey Rivett writes contemporary medical and institutional history.His two books, originally published by the King's Fund, are kept up to date on internet on this site; navigate by using the links at the top.
It involves a blood test and measuring the fluid at the back of the baby's neck (nuchal translucency) with an ultrasound scan.
If you have agreed to have screening for Down's syndrome, the dating scan and the screening will usually happen at the same time.