SAAG (serum-ascites albumin gradient)

SAAG (serum-ascites albumin gradient) is the difference between serum albumin and albumin in the ascitic fluid. It is used to discriminate the ethiology of ascites: if over 1.1 it’s in the context of portal hypertension, if under 1.1 it suggests peritoneal causes. The gradient is difficult to use in patients with very low serum albumin.

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