Sorry to be so vague. I am not a physician but my husband was diagnosed with MGUS many years ago. He finally made an appointment Dana Farber. His blood test showed an IGM high level and it indicted that he had Walldenstroms. It is very rare .
If the IGM is high it can indicate that. Don’t be afraid I am just throwing that out there. It is rare and some times missed
On a good note he has had infusion treatments over 6 years ago and is doing fine. His level has been normal.
Mayo is very familiar with that disease and has been helpful too.
M