arthritis, such as lupus erythematosus . The erythrocyte sedimentation rate (ESR), C-reactive protein [3]  ( http://www.labtestsonline.org/understanding/analytes/crp/test.html ) , full blood count , renal function , liver enzymes and immunological tests (e.g. antinuclear antibody /ANA) [4]  ( http://www.labtestsonline.org/understanding/analytes/ana/test.html ) are all performed at this stage. Ferritin can reveal hemochromatosis , which can mimic