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Interventional radiologist

A radiologist who uses image guidance methods to gain access to vessels and organs. Interventional radiologists can treat certain conditions through the skin (percutaneously) that might otherwise require surgery. The technology includes the use of balloons, catheters, microcatheters, stents, and therapeutic embolization (deliberately clogging up a blood vessel). The specialty of interventional radiology overlaps with […]

Iodide

The chemical form to which iodine in the diet is reduced before it is absorbed through the intestinal wall into the bloodstream and carried through the blood to the thyroid gland.

Iodine

An element in the diet that is essential for the manufacture of hormones by the thyroid gland. The thyroid gland uses iodine to make thyroxine (T4), which has four iodine molecules attached to its structure, and triiodothyronine (T3), which has three iodine molecules attached. Iodine is found in seafood, bread, iodized salt, and seaweed.

Iodine deficiency

A lack of sufficient iodine in the diet, which can lead to inadequate production of thyroid hormone (hypothyroidism) and enlargement of the thyroid gland (goiter). Since the addition of iodine to table salt became common, iodine deficiency has rarely been seen in the US.

IVC

1. Intravenous cholangiogram, an X-ray study of the gallbladder. 2. Inferior vena cava, the largest vein coming up below the heart to it. As an IVC filter.

IV (intravenous)

“The glucose was given intravenously.” The word “intravenous” as a noun refers to an intravenous fluid drip, a solution (usually a balanced electrolyte solution) administered directly into the venous circulation. Also called a drip.

IUGR

Intrauterine growth retardation.

IU (international unit)

An international unit (IU) is an internationally accepted amount of a substance. This type of measure is used for the fat-soluble vitamins (such as vitamins A, D and E) and certain hormones, enzymes, and biologicals (such as vaccines). The definition of an international unit (IU) is generally arbitrary, technical, and eminently forgettable. For example, an […]

IUD (intrauterine contraceptive device)

A device inserted into the uterus (womb) to prevent conception (pregnancy). The IUD can be a coil, loop, triangle, or T in shape made of plastic or metal. An IUD is inserted into the uterus by a health-care professional. Of two types of IUDs approved in the U.S., one can remain in place for 10 […]

ITP

Idiopathic thrombocytopenic purpura. A condition characterized by the sudden, abnormal lowering of the platelet count. The cause is unknown, but the immune system seems to play a major role in the process by eliminating the platelets. ITP can lead to dangerously low platelet counts that can be associated with spontaneous bleeding. Purpura are purplish bruises […]