Which of the following substances has abnormal values early in the course of multiple myeloma (MM)?

ImmunoglobulinsPlateletsRed blood cellsWhite blood cells

Explanation.

MM is characterized by malignant plasma cells that produce an increased amount of immunoglobulin that isn’t functional. As more malignant plasma cells are produced, there’s less space in the bone marrow for RBC production. In late stages, platelets and WBC’s are reduced as the bone marrow is infiltrated by malignant plasma cells.