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How Often are Pregnancy Tests Wrong?

On average, pregnancy tests have a 99 percent accuracy rate, but when taken too early, the tests are wrong fairly often, says Dr. Maher Abdallah, board certified physician in reproductive endocrinology, infertility and obstetrics and gynecology in Newport Beach, California. If a pregnancy test is taken too early after a woman misses her period, she can get a false positive. Pregnancy tests become more accurate as women become farther along in the pregnancy because hCG levels, which pregnancy tests detect, increase as the pregnancy progresses, says Abdallah.

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