Objective: - To compare the bilirubin - albumin ratio versus platelet - albumin ratio as a better indicator for predicting mortality in critically ill patients without existing liver or biliary tract disorders. Methods: - A prospective study was conducted among adults (>18 years) admitted to the ICU at a tertiary care centre in India among 196 patients. Platelet albumin ratio (PAR) and Bilirubin - Albumin Ratio (B/A ratio) were obtained from patients' records on the day of admission. Results: - The mean age of the participants was 53.8 years (SD 16.8 years). Twenty-one (10.7%) deaths were reported in the hospital during the period of study. The mean Bilirubin-Albumin Ratio (B/A ratio) was significantly higher among those who died (2.8; SD 1.7) compared to those who survived (0.6; SD 0.96; mean difference 2.2; 95% CI: 1.6 to 2.8; p<0.001). B/A ratio on admission had a good predictability (AUC 0.87, p<0.001)) of mortality, but the predictability of PAR was quite low (AUC 0.48). The cut-off for the B/A ratio for predicting mortality is 0.4 with a sensitivity of 87% and specificity of 74%.  Conclusion: - The B/A ratio is a reliable predictor of mortality in critically ill patients who do not have pre-existing liver or biliary tract disorders.