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5% Blood stained 0.5 %
Mincarriage 1%
loss rate < 1%
UK. Most amniocenteses are performed to obtain amniotic fluid for karyotyping from 15 weeks (15 +0 ) onwards.
Amniocentesis performed before 15 completed weeks of gestation is referred to as ‘early amniocentesis’.
Chorionic villus sampling (CVS) is usually performed between 11 (11 +0 ) and 13 (13 +6 ) weeks of gestation and involves aspiration or biopsy of placental villi.
CVS can be performed using either a transabdominal or a transcervical approach.
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