C3 and primary membranoproliferative glomerulonephritis: Highest relative levels (in reference to healthy controls) for LQGTPVAQMTEDAVDAERLKHL (e12939, complement C3) excretion were seen in minimal change disease (MCD), followed by nephrotic syndrome (NS), focal segmental glomerulosclerosis (FSGS), MGN, LN, diabetic kidney disease (DKD), IgAN, MPGN and C3G.