Pregnancy test?

Question

Hoping someone can clear this up for me: I know that pregnancy tests have time frames and that they are invalid after a certain amount of time, but why? Why would it sitting longer cause a line to appear in the test? Just curious honestly, hope someone can explain! Thanks ladies!

Answer

Evaporation. It's as simple as that. The urine evaporates and the residue of due and urine can form lines.

Answer

Yes. A negative test will become a positive test within hours of taking it because the dye runs after a few hours. There are at least 4 people a day saying that they took a test, it was negative,  went to work and it was positive when they got home. That's why u never read a test AFTER 10 minutes

Pregnancy test?

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