The only valid way that I'm aware of to test for low acid is the Heidelberg Capsule Swallow Test.
Here's a link:
http://www.phcapsule.com/patients/heidelberg-ph-test/
You swallow a capsule which has a thread attached to it and they tape the thread to your cheek to keep the capsule tethered in your stomach. It stays in for about 20 minutes (it might have been more like a half hour...it's been 8 years since I had it done) and they measure your stomach acid. They have you drink some things like Sodium Bicarb to change the pH and see how your system reacts. The capsule sends radio waves to a receiving machine that shows real-time information about your stomach acid.
Then, they pull it back out at the end. That made me gag a little on the way out but nothing horrible.
If you look on the web, there's all sorts of BS "advice" on testing with HCL pills or vinegar or Sodium Bicarb. But the reality is that those home tests really don't show you what you need to know - if they work at all.
It's possible that there are other newer tests out there that I'm not aware of. I haven't been keeping up too diligently these days because I'm basically FINE! So it's no longer in the forefront of my mind, I'm happy to report.

I hope everything works out well for you.
Best,
NYer
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