Spread of VWF(Ag)/ADAMTS13 ratio across patients with PCS, and overview of exercise testing and associated VWF(Ag)/ADAMTS13 ratio. (A) Histogram showing distribution of the VWF(Ag)/ADAMTS13 ratio across the post-COVID patient cohort. (B) Flowchart showing performance in exercise testing and associated VWF(Ag)/ADAMTS13 ratio. (C) Median VWF(Ag)/ADAMTS13 ratio in patients with normal and abnormal exercise test results. Median VWF(Ag)/ADAMTS13 ratio was 1.5 in patients with an abnormal result, compared with a median ratio of 1.1 in patients with a normal result. P < . 0001.