You’re wondering if kidney disease is causing the FLC to be in urine. Actually the FLC can cause kidney disease if levels get quite high ( much higher than yours). FLC are proteins that can “clog up” the tiny capillaries in kidney over time, but this process is associated with more severe disease. Your kidney function will be monitored along with the FLC ( creatinine and eGFR) blood tests. I understand your anxiety over this but encourage you to not get ahead of where you’re at. This is most likely to not progress to anything harmful. I have put my own similar situation on the back burner and rarely think about it.