Annexin A5 resistance assays for patient groups. As indicated by Rand and colleagues, the annexin A5 anticoagulant ratio for the APS syndrome with thromboembolism (group A) was significantly decreased compared with the group of aPL antibodies without thrombosis history (group B), the non-aPL thromboembolism (group C), and the healthy control group (group D). See the complete figure in the article beginning on page 2783.