ALB and infection: Composite indices such as the C-reactive protein–albumin–lymphocyte (CALLY) index, neutrophil–platelet score (NP), platelet-to-albumin ratio (PAR) and red blood cell distribution width-to-albumin ratio (RAR) provide more robust assessments of inflammation, nutrition, and immune status than single markers, and have predictive value in conditions including infections and cancer [15,16,17,18].