RENBP and COVID-19: Subsequently, the VWF:AG/ADAMTS13 activity ratios in COVID-19 (+) patients (Median:6.051 and IQR:3.824–10.17) were significantly higher (p < 0.0001) than COVID-19 (−) patients (Median:5.567 and IQR:3.352–8.245) (Figure 1F).