What does it mean if i have high immunoglobulin m qn serum?

Waldenstrom's Dz: An elevation of immunoglobulin m (igm) in the serum esp. If monoclonal (of one kind) raises the possibility of waldenstrom's macroglobulinemia - a malignancy affecting lymphocytes or plasma cells that produce this abnormal IgM protein causing symptoms of hyperviscosity - confusion, shortness of breath, stroke, kidney damage etc.

How high?: All laboratory results need to be interpreted in the clinical context and the doctor who ordered the tests is usually in the best position to do that. Talk to the doctor who ordered the tests. Having said that, it would have helped if you provided the actual value. If you do not have enlargement of lymph glands, I would watch and wait.