What techniques are used to monitor measurable residual disease and how accurate are the results?

What techniques are used to monitor measurable residual disease and how accurate are the results?
Why should an individual get a second opinion before choosing a treatment option?
What should a myeloma patient consider when choosing a treatment option?
Is maintenance therapy continuous or a fixed duration? Why? What is response adaptive therapy? How can MRD status be used guide maintenance therapy?
I'm in a complete response, why should I consider maintenance therapy? Should I consider maintenance therapy if I am MRD negative?