(1) Evidence of involvement of three or more organs, systems, and/or tissues* |
(2) Development of manifestations simultaneously or in less than one week |
(3) Confirmation by histopathology of small vessel occlusion in at least one organ or tissue† |
(4) Laboratory confirmation of the presence of antiphospholipid antibodies (lupus anticoagulant and/or anticardiolipin antibodies)‡ |
Definite catastrophic APS: all four criteria |
Probable catastrophic APS—any of the following: |
(a) All four criteria, except for only two organs, systems, and/or tissues involved |
(b) All four criteria, except for the absence of laboratory confirmation (within at least 6 weeks) owing to the early death of a patient never tested for aPL before the catastrophic APS |
(c) Criteria (1), (2), and (4) |
(d) Criteria (1), (3), and (4) and the development of a third event between one week and one month after presentation, despite anticoagulation |