Health Tip: Pregnancy Test Kit Must Be Used Correctly

Or you may skew the result

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(HealthDay News) -- Home pregnancy tests are fairly reliable, but their accuracy can be compromised if not used correctly, the Mayo Clinic says.

Possible causes of a false-positive result may be using an unclean urine collection cup, using an old or damaged kit, having an impure urine sample because of blood or excessive protein, and taking prescription drugs such as diuretics and anticonvulsants.

False-negative results may stem from taking the test too early, timing the test incorrectly, and using diluted urine.

If the results of a home pregnancy test are questionable, read the directions, call the toll-free number usually located on the test box, or take the test a second time.

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