Serum albumin concentrations lower than the obtained cut-off value of 38.5 g/L indicate a severe clinical picture in patients with COVID-19 (AUROC: 0.838, sensitivity: 81.1%, specificity: 77.3%, p < 0.0005), while values less than 34.5 g/L may indicate a risk of a lethal disease outcome (AUROC: 0.776, sensitivity: 73.0%, specificity: 65.2%, p < 0.0005) (Figure 4A,B). The gene discussed is ALB; the disease is COVID-19.