A blood test for pregnant mothers that detects an unborn child's DNA is better than standard tests at detecting Down syndrome, and returns fewer false positives, US researchers said Wednesday. The cell-free DNA blood test, which finds small amounts of floating DNA from the fetus in the mother's blood sample, can be given to a woman when she is between 10 and 14 weeks pregnant. Researchers studied nearly 16,000 women, and found that the cell-free DNA blood test correctly identified all 38 fetuses with Down syndrome in the group, said the study in the New England Journal of Medicine.
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