I haven't had IV1g influsions. Are her kidney function tests good? IV1g can impact kidneys. My polyneuropathy is still early and is associated with MGUS and celiac. I assume by elevated proteins that your mother was also tested for MGUS (monoclonal gammopathy of undetermined significance) and had blood electrophoresis tests. My IgA, IgG, and now IgM levels are elevated because of light chain kappa MGUS. Some of my plasma cells are L-shaped instead of Y-shaped. The deformed L plasma cells (sticky proteins) attack the peripheral nervous system, and can cause a host of symptoms.