Chorionic Villi Sampling (CVS) is a procedure used to sample developing placenta tissue and usually carried out between 10-14 weeks gestation.
Amniocentesis involves removal of a small volume of amniotic fluid from around the baby and is usually carried out from 16 weeks gestation onwards.
Both techniques provide a definite diagnosis in cases of chromosomal abnormality (i.e. Down’s Syndrome etc.) associated with the baby but are invasive in nature. This constitutes a small but what is regarded as a significant risk of miscarriage as part of prenatal diagnosis. Due to the success of existing screening programmes within CDS and the very small number of cases which might require such tests, we no longer carry out CVS or amniocentesis within our clinic.
CDS is able to provide rapid access to established centres very experienced in carrying out these techniques if required.
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