Nutritional Management of the Child with Cirrhosis

A 5 month old FT baby boy presented with a five day history of abdominal distention, jaundice and was found to have significant ascites and elevated AFP. Laboratory evaluation was significant for hypoalbuminemia (albumin-1.8 g/dL), coagulopathy (INR-3.5) and elevated alpha-feto protein (23,300 ng/mL). Whole exome sequencing was non-diagnostic and he was diagnosed with cryptogenic cirrhosis. During his admission his ascites is refractory to both medical therapy and repeat paracentesis. He is listed for liver transplant. Of the following, what is the best predictor of post-transplant mortality and graft survival?