Hi Sue,
It can be a good idea to do the labs first although I am not sure how much difference it can show with the different doze of pred... ??
maybe anyone else around knows ??
You reduce in steps of 5 mg every week and according to your feeling. Listen to your body like you did with the pred when treating the COPD. Its the same pred.
Are you on 20mg now ? Maybe you dont have to go back too high, maybe you can just add 5mg (total 25) and see if it helps ? Sometimes a bit more is all you need to stabilize yourself.