The examination of lymphoma first requires routine blood tests and blood smears. When aggressive lymphoma invades the bone marrow, anemia, decreased white blood cells, and platelets may occur, and lymphoma cells can appear in peripheral blood; therefore, bone marrow smears and biopsies are necessary. Additionally, blood biochemistry is important, as an increase in lactate dehydrogenase is associated with tumor burden and is an indicator of poor prognosis. Furthermore, Hodgkin's lymphoma may involve the central nervous system, so patients with symptoms of central nervous system involvement need to undergo cerebrospinal fluid examination. The most important aspect of lymphoma is the histopathological examination. Based on the histopathological examination, the pathological staging is determined, and genetic rearrangement can also be performed.