<prompt> Normal serum complement levels would be seen in patients with hematuria, proteinuria, and hypeension resulting from which of the followingMixed essential cryoglobulinemiaHepatitis C-associated membranoproliferative glomerulonephritisDiffuse proliferative lupus nephritisHenoch-Schonlein purpura  <response>: Cryoglobulinemia with renal involvement is associated with hypocomplementemia in the majority of cases. In addition, it has been well recognized that hepatitis C is often associated with cryoglobulinemia. Diffuse proliferative lupus nephritis WHO class IV is the most aggressive form of the disease and is also associated with hypocomplementemia. Early in the course of postinfectious glomerulonephritis, immune complex deposition is in full force and serum complements are low. Henoch-Schonlein purpura, the systemic manifestation of IgA nephropathy, is not associated with hypocomplementemia. Other causes of hypocomplementemia glomerulonephritis are glomerulonephritis associated with bacterial endocarditis or other chronic infections as well as membranoproliferative glomerulonephritis. Ref - Harrisons internal medicine 20e pg 2586 