Definition of Transudate

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Transudate: A fluid that passes through a membrane, which filters out all the cells and much of the protein, yielding a watery solution. A transudate is a filtrate of blood. It is due to increased pressure in the veins and capillaries that forces fluid through the vessel walls or to a low level of protein in blood serum. Transudate accumulates in tissues outside the blood vessels and causes edema (swelling).