An exudate is any fluid that filters from the circulatory system into lesions or areas of inflammation. It can be a pus-like or clear fluid. When an injury occurs, leaving skin exposed, it leaks out of the blood vessels and into nearby tissues. The fluid is composed of serum, fibrin, and white blood cells.
Transudate is extravascular fluid with low protein content and a low specific gravity less thn1.012. It has low nucleated cell counts less than 500 to 1000 /microlit and the primary cell types are mononuclear cells: macrophages, lymphocytes and mesothelial cells.