Calculation of SAAG is performed by measuring the serum albumin and ascitic fluid albumin concentrations simultaneously and then subtracting the ascitic fluid albumin from the serum albumin. A SAAG of >1.1 g/dL is 97% accurate in detecting portal hypertension (Fig. 13.2).
Additionally, what is high SAAG ascites?
The SAAG correlates with the sinusoidal pressure,6 and a SAAG ≥1.1 g/dL (high SAAG ascites) indicates a hepatic vein–portal vein pressure gradient more than 11 mm Hg (i.e., portal hypertension). High SAAG ascites is almost always caused by a sinusoidal or postsinusoidal source of the ascites.
Then, how is SBP ascites calculated?
The absolute PMN count in the ascitic fluid is calculated by multiplying the total white blood cell count (or total “nucleated cell” count) by the percentage of PMNs in the differential.