Researchers in London have made a breakthrough in the search for a new form of pre-natal testing. The test can establish the sex of a foetus at just five weeks. The risk of miscarriage associated with amniocentesis, the current testing procedure, is avoided since the sample of foetal DNA is extracted from the mother's blood rather than the uterus. The foetal cells can be analysed genetically for a wide range of genetic disorders very early on in pregnancy.
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