Study: Blood Test Can Determine Baby’s Gender at 7 Weeks

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France's First Lady Carla Bruni Gives Birth

Expectant parents can find out the sex of their unborn child as early as seven weeks into a pregnancy, according to findings from a study published Tuesday.

Results come from a blood test that tests the fetal DNA in the blood of the mother. At seven weeks, the tests are 95 percent accurate. The tests are 99 percent accurate at 20 weeks into pregnancy – the point in time at which most people who want to know the gender of their baby can have it determined via ultrasound.

Tests to determine a baby’s gender have been around for awhile, but many of these tests are for urine, which is less accurate method. Many of these tests also instruct women to test as early as five weeks, but this has proved to give many inaccurate results.

The home tests, which cost about $250 apiece, require a woman to prick her finger, collect a blood sample, and send it back to the laboratory for testing. The lab will test for the presence of a Y chromosome. If one is detected, the offspring is male. If not, the result comes back as female.

The study was published online in the Journal of the American Medical Association.