<prompt> All may be true about Rheumatoid Ahritis except:Anti-MCV assayRF positiveAnti- CCP antibodyAnti- Mi-2 antibody  <response>: Anti Mi-2 antibodies are useful for diagnosis of dermatomyositis Laboratory studies in suspected RA fall into 3 categories--markers of inflammation, hematologic parameters, and immunologic parameters--and include the following:- Erythrocyte sedimentation rate ESR C-reactive protein CRP level Complete blood count CBC Rheumatoid factor RF assay Antinuclear antibody ANA assay Anti cyclic citrullinated peptide anti-CCP and anti mutated citrullinated vimentin anti-MCV assays 