If a screening test indicates a possible problem – or your age, family history or medical history puts you at increased risk of having a baby with a genetic problem – you might consider a more invasive prenatal diagnostic test.
The chorionic biopsy involves getting a sample of the chorionic villus for cytogenetic study.
The access ways are transcervical and transabdominal.
The procedure can be done after 10 weeks of amenorrhoea.
The risk of miscarriage is estimated at 1%.
