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Haematemesis: blood in the vomit
Haematoma: a collection of blood in which the blood is usually clotted. It is usually found within an organ or a muscle
Haemodialysis: a dialysis machine is used to filter waste products from the blood
Haemoglobin: the oxygen-carrying pigment in red blood cells
Haemophilia: a group of inherited bleeding disorders causing ability of the blood to clot
Haemorrhage: bleeding or the abnormal flow of blood
Haemorrhoid: an enlarged vein in the wall of the anus
Haemostasis: the stoppage of bleeding or haemorrhage
Heart attack: death the heart muscle due to the loss of blood supply
Heparin: an anti-clotting drug
Hepatic: related to the liver
Hepatitis: inflammation of the liver
Heredity: genetic transfer from parent to child
Hernia: a protrusion of tissue through a wall of the cavity in which it is usually contained
Hip dislocation, congenital: the abnormal formation of the hip joint in which the ball at the top of the thighbone is unstable within the socket, usually causing the ligaments of the hip joint to be loose and stretched. Also called DDH – developmental dislocation of the hip
Histology: the study of the structure of cells. Usually associated with biopsy assessments
Hormone: a chemical that controls and regulates the activity of cells and organs
HTLV-I: human T-lymphotropic virus type I
Hyper-: prefix meaning "high, beyond, excessive, above normal" eg hyper tension – high blood pressure
Hypo-: prefix meaning "low, under, beneath, down, below normal" eg hypoglycaemia (low blood sugar)
Hypoxia: a low and abnormal concentration of oxygen
Hypoxic-ischemic encephalopathy: damage to cells in the central nervous system, of the brain and spinal cord from inadequate oxygen
Hysterectomy: a surgical operation to remove the uterus and, sometimes, the cervix
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