Why do you need two strips on a pregnancy test if one means you are not pregnant?

Why do you need two strips on a pregnancy test if one means you are not pregnant?

Pregnancy Check by Pregnancy Strip Test

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answers (2)

Answer 1
May, 2021

Apparently, the author wanted to ask why not make a test with only one strip showing a positive result. That is, if there is no positive result, then such a test will not show any visible signs. So how do you know if it works at all?

Answer 2
May, 2021

The first strip is control. If it does appear, it means that the test is working and you used it correctly. The second line means pregnancy.

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