New classification criteria for antiphospholipid syndrome — 2023

Antiphospholipid syndrome (APS) is an autoimmune disorder characterized by the clinical presence of thrombotic episodes, and — in women — obstetric complications with the laboratory presence of antiphospholipid antibodies in blood. The main objective of this report is to present in detail the new American College of Rheumatology (ACR)/Alliance of Associations for Rheumatology (EULAR) APS classification criteria. According to EULAR methodology they include entry criterion indispensable to initiate classification process and contain 8 clinical and laboratory domains allowing to classify patient as having APS with 99% specificity.