Why does it take more than one pregnancy test to get 100% certainty? Why is one usually not trusted?
In: Biology
Because they’re not 100% accurate. If they’re 90% accurate (for example) and you just take one, you have a 90% chance of being right and 10% chance of being wrong.
If you take a second test and it says the same as the first, you now have a 99% chance of being right and a 1% chance of being wrong
And so on
It’s all about statistics: the more tests you take that all say “positive,” the higher the chance that you’re actually pregnant.
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