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The accumulation of fluid in the peritoneal cavity. It becomes readily detectable when > 500 ml are present.

1. Portal hypertension

SAAG more/=1.1

The serum-ascites albumin gradient (SAAG) is calculated by subtracting the ascites albumin concentration from the serum value. A SAAG value of greater than 1.1 g/dL predicts a portal hypertensive cause with more than 95% accuracy. Values less than 1.1 g/dL are associated with neoplasms, tuberculosis, pancreatitis, or bile leak.

2. Other cause

SAAG less than 1.1

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