I found this for testing stomach acid (Jernigan's)
hansacenter.com/simple-at-home-test-for-low-stomach-acid/Not sure if it's a good way to test..
A binder is something you ingest that will bind to the toxins (and everything else in your digestive system) and usher it out.
Examples: activated charcoal (what I take), chlorella, cholestyramine, Diatomaceous Earth....(there are more - those are off the top of my head)
You need to take them a few hours away (on either side) from food/supplements/antibiotics, as they will be removed with the binder, as well.