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Why shouldn't you look at a HPT after 10 mins?

(3 Posts)
Incacola Fri 14-Mar-14 20:17:42

I did a HPT this morning and decided that nothing was developing in the positive line before the 2 mins was up so put it in the bin. I later went back to it and there was a faint line. The instructions very clearly say don't read it after 10 mins. Is that because the test can give a false positive?

I did another HPT later today and it was BFN.

NickNacks Fri 14-Mar-14 20:19:06

Yes it's because the liquid dries up and leaves a watermark (evaporation line) which can be misinterpreted as a positive line.

Incacola Fri 14-Mar-14 20:22:22

Thanks NickNacks, that makes sense.

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