Simplistic breakdown of the new MPGN classification using immunofluorescence as the basis and an approach to evaluation when the kidney biopsy indicated MPGN. DDD, dense deposit disease; IF, immunofluorescence; SPEP, serum protein electrophoresis; TMA, thro... Simplistic breakdown of the new MPGN classification using immunofluorescence as the basis and an approach to evaluation when the kidney biopsy indicated MPGN. DDD, dense deposit disease; IF, immunofluorescence; SPEP, serum protein electrophoresis; TMA, thrombotic microangiopathy; UPEP, urine protein electrophoresis. Naveed Masani et al. CJASN 2014;9:600-608 ©2014 by American Society of Nephrology