That's because once it dries on the testing strip, urine may leave a faint line where it evaporated – called an evaporation line or "evap line." Unlike positive result lines, which are usually ...

A very faint line on a pregnancy test can be confusing, especially if you’re hoping you’ve conceived this month. Could it be a faint positive or an evaporation line? Many home pregnancy tests have two ...

It can cause a false positive result or a faint line ... Important: If a test gets wet or is left out too long, an evaporation line, which is a faint streak may appear on a pregnancy test.