SAAG — Serum-Ascites Albumin Gradient Calculator

Ascites Albumin Gradient (SAAG)

SAAG = Serum albumin − Ascites albumin. Enter values below (range 0–10 g/dL). No commas allowed.

Serum Albumin

Ascites Albumin

Decimal precision

Press Enter to calculate

Hint: SAAG > 1.1 g/dL → portal hypertension likely. SAAG ≤ 1.1 g/dL → other causes.

How this calculator works

The serum-ascites albumin gradient (SAAG) is calculated as:

SAAG = Serum albumin − Ascites albumin

Because both values are converted into the same unit, the difference reflects the oncotic gradient. A SAAG > 1.1 g/dL indicates portal hypertension with ~97% accuracy.

References

Runyon BA. Ascitic Fluid Analysis in the Differential Diagnosis of Ascites. Semin Liver Dis. 1997.
Rockey DC, et al. AASLD Practice Guidelines: Management of Adult Patients with Ascites. Hepatology. 2009.

Disclaimer

For educational purposes only. This calculator is not intended to replace clinical judgment, diagnosis, or management decisions. Always consult relevant clinical guidelines and experienced healthcare providers.