This is sometimes my example for ‘why paying attention to documentation is important’. I didn’t take the photo myself, a colleague sent it to me years back.

  • Earthwormjim91@lemmy.world
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    1 year ago

    Yup that’s exactly what it is.

    For pretty much every test like this. Pregnancy, ovulation, flu, Covid, you name it. One line is negative because the top line is the control because the control line reacted but the reactive line didn’t , two lines is positive because the control line reacted as well as the reactive line, and no lines (or no top line and a bottom line) is an invalid test because the control didn’t react at all.