الفهرس 
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Abstract
One of the common diagnostic problems encountered by the internist and nonary specialist is the presence of fluid in the pleural space (Storey et al», 6). The differentiation between exudates and transudates is the initial step in analysis of pleural effusions as it often gives an indication of the underlying ophysiologic process , the differential diagnosis and the need for further in-igations (Burgess et al., 1995), Transudates have few possible causes and do not require resorting to the in- ’e diagnostic techniques that are necessary to distinguish among the many ble causes of exudates (Sahn , 1987).
Measuring the total protein content in the pleura! fluid was used to sparate ; en transudate and exudate , as the total protein content of the transudate is han 3 gm % , while an exudate contains more than 3 gm % (Glauser , Jsing this cut - off level correctly classified all cases in the present study % misclassification results in the study of Light et al (1972), 11 % in the ofHamin et al (1987) ,14 % in the study ofEL-Shimy et al (1990), and the study of EL - Behiedy et ill (1992).