serum immunoglobulins igg , iga , and igm , serum complement components c3 and c4 , circulating immune complexes , antinuclear antibodies , and rheumatoid factor were measured in 56 patients with rheumatoid arthritis ( ra ) and nephropathy ( 23 with mesangial glomerulopathy ; 13 with membranous glomerulonephritis ; and 20 with amyloidosis ) and 35 patients with ra without nephropathy ( controls ) .
C0268731
glomerulopathy
C0022658
nephropathy