Hematology is a medicine branch concerned with the study, diagnosis, treatment and prevention of diseases that affect the blood and its components production, such as blood cells, hemoglobin, proteins of blood and the mechanism of blood clotting. Hematology is also concerned with in the science of blood transfusion, the blood bank works and tumors of the blood, such as lymphoma, leukemia, the science of bone marrow and stem cell transplant.

Hematology is especially concerned with the laboratory procedures used in the diagnosis of blood diseases, including blood smears slides, ​​bone marrow smears slides under a microscope and the tests of blood clotting.

The immunology is the science that studies the body's ability to resist certain harmful substances such as bacteria and viruses that cause diseases. Immunology is concerned with the ways of which the body uses to defend itself against diseases and harmful organisms through a complex system consists of a group of cells, molecules and tissues called the Immune System. This system provides protection against a variety of harmful substances that invade the body. Immunology is also concerned with studying the diseases that affect the immune system such as Human Immunodeficiency Virus (HIV) and immune increase such as in the case of autoimmune and immune changes that accompany organ transplant operations and how to overcome them. Immunology is also concerned with fortifying some patients with vaccines for the prevention from some of acute life-threatening injuries.