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What happens when you use an expired pregnancy test?

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Quick Answer

The most common complication with using an expired pregnancy test is receiving a false negative reading, according to WebMD. Any pregnancy test that is past its expiration date can return a false positive or false negative reading, but the latter is far more likely.

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Full Answer

Expired pregnancy tests often lose their ability to register hCG, the hormone that signifies the early stages of a pregnancy, according to BabyHopes.com. Using a pregnancy test past its expiration date typically results in a false negative reading, but false positive pregnancy tests are not uncommon. If the expired pregnancy test has been exposed to heat or moisture, a false positive test can result.

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