2023 American College of Rheumatology/European League Against Rheumatism antiphospholipid syndrome classification criteria solid phase-based antiphospholipid antibody domain-collaborative efforts of Antiphospholipid Syndrome Alliance for Clinical Trials and International Networking and ISTH SSC to harmonize enzyme-linked immunosorbent assay and non-enzyme-linked immunosorbent assay antiphospholipid antibody tests: communication from the ISTH SSC Subcommittee on Lupus Anticoagulant/Antiphospholipid Antibodies.