Reasons for 3x normal kappa lambda light chain b2m=4.4 elevations in CKD? Oncologist says no myeloma or mgus. Asking because doctors couldn't answer.

Second opinion. You live in NYC. I don't know where you went but there are great oncologists in the City. Take your lab data with you and go to MSKCC or Columbia or Cornell or NYU. Somebody doesn't have their thinking cap on!