Monoclonal elevation of circulating IgM concentration

What it means

Presence of a monoclonal immunoglobulin M protein in the serum.

This is a characteristic feature of Waldenstrom macroglobulinemia (WM), which is defined as a B-cell lymphoplasmacytic lymphoma, characterized by monoclonal immunoglobulin M protein in the serum and infiltration of bone marrow with lymphoplasmacytic cells.

Rare diseases that can present with this4

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Waldenstrom macroglobulinemia