Can this blue dye test be trusted?

Jeanne • First Glow Baby born 7/31/16. Expecting #2 in March 2018.
A good friend of mine has been TTC for over a year now, now using <a href="https://glowing.com/glow-fertility-program">IUI</a>. She took this test with FMU today, but my own gut response was not to trust blue dye tests. Since I never used them, I don't know what to tell her, but I know this board was a HUGE help to me while I was still TTC.
 What do you ladies think?