Hematopathology is the scientific study of disease as it affects the blood, the production of blood, and every organ of the body involved in hematopoiesis, which is the production of the cellular components of blood. Hematopathology work frequently includes working with tissue samples, searching for treatment options, and otherwise understanding the pathology of problems relating to blood. Diseases addressed by this field include problems like lymphoma and leukemia. Outside of research work, hematopathologists help to test blood samples and diagnose medical conditions for patients. Most hematopathologists are specialists who work at major hospitals, medical universities, and laboratories, and they focus exclusively on this field.