If a test is taken correctly (at the right time, following the directions, etc.), then the rate of false negatives is going to be very low. I believe First Response notes those tests at 99% accurate.
The most common causes of false negatives are going to be incorrectly taken tests or testing too early. A small number will be caused by errors in test manufacturing or other factors...but really, failure rates are pretty low if you use a good test and follow the directions.
-------------------- Sarah Liz Posts: 7316 | From: USA | Registered: Oct 2000
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