I came across a CRP test kit which can be used at home to monitor CRP levels. The system Consists of a small machine + a testing kit which can be bought a cost of $1612(appox) for the machine,
and $181(appox) for the test kit, which consists of 25 tests. The machine is called the Quick Read GO CRP.
Please see here: https://www.youtube.com/watch?v=QDprwMdv7y4&t=92s
I think being able to do your own CRP test at home is very good resource for people with AS since we can monitor whether a particular treatment is working OR NOT, and we can take early action.
Some of us have a very high tolerance to pain and just ignore the problem, if however we see a physical result. It will motivate us to take action sooner and prevent damage long term.