I got the results yesterday afternoon. M-spike is 4.6. It hasn't moved since November. My IgG went up a teeny bit, but last time it was down a teeny bit, so it's still sort of hovering around the same place it's been for the past six months. My IgA and IgM are still a little too low. Everything else is OK. Hurrah!
So ... it looks like I passed my tests for this round. I called up to Mayo and scheduled my next appointment for March. I should be doctor-free until then.
Good boy, Spike. Sit. Stay.