β2-Microglobulin(B2M) Determination Reagent(Latex Immunoturbidimetry) is an in vitro diagnostic quantitative test kit. B2M is used to evaluate the severity and prognosis of multiple myeloma, chronic lymphocytic leukemia, or non-Hodgkin's lymphoma; It also can be used to detect kidney damage and distinguish between glomerular and tubular kidney disorders. β2-microglobulin  is a small membrane protein that is a component of the class I major histocompatibility complex found on the surface of all nucleated cells.