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carbohydrate deficient transferrin
Carbohydrate-deficient transferrin (CDT) is a laboratory test used to help detect heavy ethanol consumption.
==Physiology==
Transferrin is a serum protein that carries iron through the bloodstream to the bone marrow, where red blood cells are manufactured, as well as to the liver and spleen. Structurally, transferrin is a polypeptide with two ''N''-linked polysaccharide chains. These polysaccharide chains are branched with sialic acid residues. Sialic acid is a monosaccharide carbohydrate.
Various forms of transferrin exist, with differing levels of sialylation. The most common form is tetrasialotransferrin, with four sialic acid chains. In persons who consume significant quantities of alcohol (usually more than 4 or 5 alcoholic beverages a day for two weeks or more), the proportion of transferrin with zero, one, or two sialic acid chains is increased. These are referred to as ''carbohydrate-deficient transferrins''. These carbohydrate-deficient transferrins can be measured in the bloodstream, and are an important marker for alcohol abuse.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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