ESR1 and COVID-19: The main characteristics of patients with COVID-19, as determined by laboratory test results on admission, were as follows: normal ranges of white blood cell count, neutrophil count, and PLT count; decreased serum level of calcium; and increased serum levels of CRP, ALK-p, direct bilirubin, LDH, AST, and ALT, and increased red blood cell (RBC) distribution width – standard deviation (RDW-SD) and ESR.