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There is some trial work going on to get kits for you to use to test Faecal calprotectin at home and use the camera and an app in your phone for analysis. Obviously there is a hurdle of actually having to handle faeces and put a sample in a tube so it is not something people would love to do. But it could be something people with IBD could do in the future to catch flare ups of their disease early.

https://en.wikipedia.org/wiki/Faecal_calprotectin

Having it actually built in to your toilet would of course be better.

There is a team at RIT working on one - https://arstechnica.com/science/2019/02/high-tech-toilet-sea...

I’ve seen their pitch for commercializing it and it seems legit (without having done a ton of due diligence).

Theranos #2

Hate to be that person, but it'd be Theranus