B2M and lymphoma: The workup in a patient with suspected lymphoma usually starts with comprehensive chemistry panel including complete blood counts with differentials, hemostasis parameters, renal function, hepatic function, lactate dehydrogenase enzyme (LDH), beta-2-microglobulin (B2M), hepatitis B and C, Epstein–Barr Virus (EBV), and human immunodeficiency viral serology.