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Do my blood tests results indicate MGUS or MM?
Light chains kappa 26.3 mg/l, lambda 11.0, ratio 2.39; gamma glob 3.7, M spike 3.5, glob total 5.7, mch 33.9, platelets 564, anion gap 9, protein total 9.6 g/dl, globulin total 5.6, and esp igm 4,655 mg/dl.
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If only IgM is elevated, then Waldenstrom's Macroglobulinemia is possible. Rarer than MM, but much less aggressive. Many papers on it. Here's one on diagnosing it. Many hematologists may have never seen it. https://www.nature.com/articles/s41375-022-01762-3