...but normal ESR? My mum was diagnosed with Rheumatoid arthritis several years ago but has recently had normal ESR levels so they are rethinking the diagnosis and trying to pawn her off with a Fibromyalgia diagnosis which typically doesn't cause inflammation (which she suffers from several times a month). This past week her hands were swollen so they drew blood again DURING a swelling episode and it revealed a normal ESR but elevated C-RP. Her GP says she has never seen this before and searching the net has proved fruitless for me. Mum has to wait several months to see a specialist (UK health system) but in the meantime I'd like to see if we can get some clarification on how this can be. It seems strange to me that both are inflammation markers, but only one is elevated when she is inflamed! Anybody have any insights?

Thanks!