Anyone know what a low IgA Quant and low IgG Serum means. I now high can be bone cancer, but from what I can pull up think it is with the kidney? Very confusing. Only have one normal sized kidney, so little concerned think too much or not enough protein? Or perhaps could just be from the prednisone? I don't think it is bad, better low than high. Thanks as always for any info. This website is a true life saver!