The development of the serum ascites-to-albumin gradient (SAAG) has replaced the description of exudative or transudative fluid. When the gradient between the serum albumin level and the ascitic fluid albumin level is >1.1 g/dL, the cause of the ascites is most likely due to poal hypeension; this is usually in the setting of cirrhosis. When the gradient is <1.1 g/dL, infectious or malignant causes of ascites should be consideredIn Budd Chiari syndrome SAAG is >1.1 i.e poal hypeensionReference: Harrison&;s Principles of Internal medicine; 19th edition; Chapter 35; Cirrhosis and its complications