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| CVS can also be used to detect chromosomal abnormalities but it can be performed earlier - between weeks 10 and 12 of pregnancy. A sample of placental tissue is taken, either by passing a needle through the mother's abdomen and into the uterus, or by inserting a thin tube through the cervix and into the uterus. CVS is almost 100% accurate, but it is associated with a higher rate of miscarriage (approximately one in 100), and results are available in around two weeks | ||||||||||
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