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Maternal Blood Test Can Determine Sex of Fetus at 7 Weeks

U.S. News and World Report,  Aug 9, 2011
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A simple blood test from mom can spot the sex of a fetus as early as seven weeks into a pregnancy, Boston researchers report. Because it is noninvasive, the test doesn't carry the same risks, such as miscarriage, as other methods for determining gender. The test works by scouring free-floating DNA in the mother's blood, looking for "Y" or male chromosomes. If no Y chromosomes are detected, the fetus is presumed to be a girl.

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