7 months post transplant and had a complete response. Been on maintenance of Darzalex ( every other week) and Revlimid ( 10 mg). Originally diagnosed last year with lambda light chain. (IGG). This week my monthly results came back and, My M spike changed from zero to .21 and the notes said IGG type Kappa. I read that Darzalex can cause a false positive on monoclonal test. Anyone else experience this? Your thoughts?