Likely need to see an oncologist to get an answer if it was a GP that told you this. Kappa and lambda are on opposite arms (light chains) of a Y shaped antibody. Starting out, my lambda was normal range and kappa was just above, then the kappa started ramping up after a few years, so the kappa/lambda ratio is now ~29. Lambda is still normal. MGUS is a waiting game, seeing how the trends in your bloodwork give up info.