ALB and COVID-19: Hydration percentage and ECW/TBW showed a positive correlation with COVID-19 clinical score (r = 0.394, p < 0.001 and r = 0.541, p < 0.001, respectively), CRP (r = 0.220, p = 0.013 and r = 0.283, p = 0.001, respectively), CRP/pre-albumin (r = 0.263, p = 0.026 and r = 0.379, p = 0.001, respectively) and BUN/creatinine (r = 0.218, p = 0.015 and r = 0.281, p = 0.001, respectively).