Inflammatory markers still high

My dad has the same issues with his 'Serum C reactive protein level'
I know they keep putting him on steroids then weening him off then having to restart again , I think they told him he has polymyalgia - but I think that's what they call stuff like that when they dont really not what it actually is and it obviously may not be what you have

Note: he is NOT diabetic, so whilst steroids are definitely not good long term he at least doesn't have the blood sugar problems to worry about