Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «T»:
Threonine: An amino acid, one of the 20 building blocks of protein. A dietary essential amino acid, threonine is necessary for optimal growth in childhood but its exact roles in metabolism are unknown. Symbol: Thr....
Thrive, failure to (FTT)
Thrive, failure to (FTT):
Refers to a child whose physical growth is significantly
less than that of peers. There is no official consensus on
what constitutes FTT. It usually refers to a child whose
growth is below the 3rd or 5th percentiles for their age or
whose growth has fallen off prec...
Throat: The throat is the
anterior (front) portion of the neck beginning at the back of the mouth, consisting anatomically of the pharynx and larynx. The throat contains the trachea and a portion of the esophagus....
Thrombectomy: Procedure to remove a clot (a thrombus)....
Thrombi: Just the plural of thrombus. See:
Thrombin: A key clot promoter, thrombin is an enzyme
that presides over the conversion of a substance called fibrinogen to fibrin, the right
stuff for a clot....
Thrombinogen: Better known today as prothrombin, a coagulation (clotting) factor needed for the normal clotting of blood.
There is a cascade of biochemical events that leads to the formation of the final clot. In this cascade, prothrombin is a precursor to thrombin. Because prothrombin comes before...
Thrombocyte: A platelet. Crucial to normal blood
clotting. Although platelets are sometimes classed as blood cells, they are not. They are
fragments of a large cell called a megakaryocyte (literally, a large cell). ...
Thrombocythemia: An abnormally high number of platelets in the blood. Also known as
Thrombocytopenia: A low platelet count. Platelets are irregular, disc-shaped
element in the blood that assists in blood clotting. thrombocytopenia can arise
due to decreased production of platelets in the bone marrow or increased
breakdown of platelets in the bloodstream, spleen, or liver. Thromb...
Thrombocytopenia, heparin-induced: Low blood platelet count as a result of the medication heparin. Heparin is used to treat and prevent abnormal blood clotting. Heparin-induced thrombocytopenia can be mild or serious and fatal....
Thrombocytopenia-absent radius syndrome
Thrombocytopenia-absent radius syndrome:
See TAR syndrome....
Thrombocytopenic purpura, acute
Thrombocytopenic purpura, acute: See: Acute thrombocytopenic purpura....
Thrombocytosis: See thrombocythemia....
Thromboembolism: Formation in a blood vessel of a clot (thrombus) that breaks loose and is carried by the blood stream to plug another vessel. The clot may plug a vessel in the lungs
(pulmonary embolism), brain (stroke), gastrointestinal tract, kidneys, or leg. Thromboembolism is an important cause...