Serum Ascites Albumin Gradient

SAAG = Alb_serum - Alb_ascites

>1.1 g/dL = high gradient; ascites due to portal hypertension
<1.1 g/dL = low gradient; ascites not associated with increased portal pressure

References:
Runyon BA. Ann Intern Med. 1992 Aug 1;117(3):215-20. -> PubMed