Beta-2-Microglobulin, Serum analysis is a test designed to measure the level of the protein beta-2-microglobulin in the blood. This protein is an important indicator of immune-related diseases, such as kidney inflammation and certain types of cancer, including leukemia and lymphoma. The results can help assess disease severity and monitor treatment response. This analysis is also used to estimate kidney function, as protein levels are linked to the efficiency of organs in clearing it from the body.