Hematology, also spelled haematology (from the Greek , haima "blood," and -λoγία), is the branch of medicine concerned with the study, diagnosis, treatment, and prevention of diseases related to blood. Hematology includes the study of etiology. It involves treating diseases that affect the production of blood and its components, such as blood cells, hemoglobin, blood proteins, bone marrow, platelets, blood vessels, spleen, and the mechanism of coagulation. The laboratory work that goes into the study of blood is frequently performed by a medical technologist or medical laboratory scientist. Hematologists also conduct studies in oncology and work with oncologists, people who may specialize only in that field instead of both-the medical treatment of cancer. There are various disorders that people are affected by hematology. A few of these different types of blood conditions that are looked at include anemia, hemophilia, general blood clots, bleeding disorders,etc. As for related blood cancers such as leukemia, myeloma, and lymphoma, these are more serious cases that need to be diagnosed.