Just recently diaganosed as well with MGUS. I'll soon be scheduled for a bone marrow biopsy. My provider told me if the plasma cell count is < 0% I should be OK and should be checked every three or four months. A lot of people live for years at this level. If 10-60% it's classsed as smoldering myeloma a slow growing type of multiple myeloma. 60%+ if full on multiple myeloma. Good luck to all of us.