Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
Hematocrit: The proportion of the blood that
consists of packed red blood cells. The hematocrit is expressed as a
percentage by volume. The red cells are packed by centrifugation.
For example, an hematocrit of 25% means that there are 25
milliliters of red blood cells in 100 milliliters of blood...
Hematologist: A physician who is specially trained in the diagnosis, treatment, and prevention of diseases of the blood and bone marrow as well as the immunologic, hemostatic (blood clotting) and vascular systems. Because of the nature of blood, the science of hematology profoundly affects the under...
Hematology: The diagnosis, treatment, and prevention of diseases of the blood and bone marrow as well as of the immunologic, hemostatic (blood clotting) and vascular systems. Because of the nature of blood, the science of hematology profoundly affects the understanding of many diseases....
Hematology-oncology: The diagnosis, treatment and prevention of blood diseases (hematology) and cancer (oncology) and research into them. Hematology-oncology includes such diseases as iron deficiency anemia, hemophilia, sickle cell disease, the thalassemias, leukemias and lymphomas. Abbreviated hem-...
Hematoma: An abnormal localized collection of blood in which the blood is
usually clotted or partially clotted and is usually situated within an organ or a
soft tissue space,
such as within a muscle.
A hematoma is caused by a break in the wall of a blood vessel. The
break may be spontaneous, as in...
Hematoma, epidural: See: Epidural hematoma.
Hematoma, extradural: See: Epidural hematoma.
Hematoma, intracerebral: See:...
Hematoma, intracranial: A hematoma (a collection of blood) within the cranium (skull). The bleed may or may not be within the brain itself.
See Epidural hematoma; Subdural hematoma; Intracranial hematoma.
Hematoma, nasal septum
Hematoma, nasal septum: See: Nasal septum hematoma....
Hematoma, subcutaneous: A collection of blood that has clotted just beneath the skin surface.
Hematoma, subdural: See: Subdural hematoma.
Hematophobia: An abnormal and persistent fear of blood is called hematophobia. Sufferers of this very common phobia dread the sight of their own blood, the sight of the blood of another person or an animal, and sometimes printed or filmed images of blood or even thoughts of blood. Blood may remind t...
Hematopoiesis: The production of all types of blood cells generated by a remarkable self-regulated system that is responsive to the demands put upon it.
The levels of the different types of the white blood cells in the granulocyte series (the neutrophils, eosinophils, and basophils) are normally m...
Hematopoietic: Pertaining to hematopoiesis...