Criteria |
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Classification |
Definite catastrophic APS |
Requires all 4 criteria |
Probable catastrophic APS |
All 4 criteria, except for only two organs, systems, and/or sites of tissue involvement or |
All 4 criteria, except for the laboratory confirmation at least 6 weeks apart due to the early death of a patient never tested for aPL before the catastrophic APS or |
Criteria 1, 2, and 4 above or |
1, 3, and 4 and the development of a third event in more than a week but less than a month, despite anticoagulation |
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