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Saag Calculator


FAQ

How do you calculate SAAG?

SAAG calculator uses the following formula:

SAAG = Serum Albumin - Ascitic Fluid Albumin

What is the normal range of SAAG?

  • SAAG > 1.1 g/dL (>11 g/L) is a reliable (97% accuracy) diagnostic of portal hypertension (or a non-peritoneal condition) as the cause of ascites. 
  • However, the value of ascites albumin gradient alone does not provide any clues to the cause of this hypertension (e.g., liver cirrhosis). 
  • This range corresponds to the ascitic fluid being a transudate.

What causes a low SAAG?

  • SAAG < 1.1 g/dL (<11 g/L) indicates ascites of non-portal nature or a peritoneal origin (for example, peritonitis).
  • This range corresponds to the exudate nature of the ascitic fluid.

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