@grrranny
I have not tested positive using the older RF test, but I did test positive on the CCP test. It's a newer test that can detect RA inflammation. You can have RA, but not test positive on the RF test, they call it sero-negative RA. The CCP test was developed to help detect it. If you can find a rheumatologist that will treat the symptoms of inflammation regardless of test results, that's a helpful approach. Here's a link to the CCP test info: https://www.healthline.com/health/ccp-antibody-test