CRP and COVID-19: Some studies reported that hematological parameters such as white blood cell count (WBC), lymphocyte count, neutrophil count, eosinophil count, platelet count, hemoglobin, neutrophil-lymphocyte ratio (NLR), C-reactive protein (CRP), platelet-lymphocyte ratio (PLR), Lymphocyte-to-monocyte ratio (LMR) and C-reactive protein-to-lymphocyte ratio (CLR) are helpful in stratifying the severity of patients with COVID-19 [11–14].