As for how long can an OPK test stay positive, depends on the woman according to my research. for some women it could be only 12 hours (and can be missed it only testing once a day). For some women it is said it can be as long as 2-3 days. It depends on how much LH her body produces, and how quickly it dissipates in her urine.
Clear Blue Plus Pregnancy Test with Blue Dye (+ / - ) This is what a negative looks like: Side Note: Blue dyes are often said to more frequently give false positives than pink dye. Some online boards that will tweak (alter) a pregnancy test photo to help individuals identify if the test is a faint positive or indeed negative, often will not do blue dyes.
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