ALBI = (log10 bilirubin × 0.66) + (albumin × -0.085), where bilirubin is in μmol/L and albumin in g/L

Reference:

Assessment of liver function in patients with hepatocellular carcinoma: a new evidence-based approach-the ALBI grade
Philip J Johnson et al. J Clin Oncol. 2015

Validation and Potential of Albumin-Bilirubin Grade and Prognostication in a Nationwide Survey of 46,681 Hepatocellular Carcinoma Patients in Japan: The Need for a More Detailed Evaluation of Hepatic Function
Atsushi Hiraoka et al. Liver Cancer. 2017 Nov

Albumin-bilirubin (ALBI) score at admission predicts possible outcomes in patients with acute-on-chronic liver failure

Bo Chen, MD and Sha Lin, MD