APOH and Venous thrombosis: In the COVID-19 patients, no significant difference was identified in the level of β2GPI between thrombosis and non-thrombosis COVID-19 patients (92.0 ug/ml [IQR: 67.6-114.4] vs. 93.7 ug/ml [IQR: 73.8, 122.7], p =0.62) (Figure 3B).