Blood Tests (CRP ESR) Levels: Whats Normal? Hello all hope the wet and windy weather is not causing havoc with everyones RA or PsA. After years still dont know what each of these markers mean or whats normal. My bloods book says these markers should be below a certain figure (cant remember what or find book due to mtx brain fog). My bloods move either side of markers, the arthitis feels no different, in fact I feel its spreading...