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Are Blood Tests Better at Determining Pregnancy?

When it comes to confirming pregnancy, both urine and blood tests are accurate — which one you choose depends on how long you're willing to wait for results. "Blood tests are not necessarily better, they're just more sensitive to the pregnancy hormone," said Dr. Alyssa Dweck, an obstetrician and gynecologist with the Mount Kisco Medical Group in New York. "Because of the increased sensitivity, they will turn positive sooner." Blood tests can show a positive just six to 12 days after ovulation, while urine tests usually aren't accurate until the first day of a missed period, she said.

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