I use how I feel as well as the results of recent CRP and Sed Rate test to assist in the decision making process.
My Rheumy uses only how you feel and historically that has failed me.
If I have any pain that cannot otherwise be identified, like osteoarthritis, I do not taper.
And if either of my inflammatory markers are outside of normal I do not taper.
I review the status every 30 days. My PCP is running monthly labs for me. I am at 7 mg prednisone currently. Below 10 I will only do 30 days. I want to give my body the time it needs to adjust to each taper. My endo is good with anything below 10.
Tapering is used to help determine if you have gone into remission as well as to monitor adrenal recovery. Tapering is an art and not just a science. One size does not fit all.
Remember, PMR is a default Dx and they do not fully understand it. This means that treatment protocols are not mature.