Application of the 2023 ACR/EULAR antiphospholipid syndrome classification criteria to patients fulfilling the 2006 revised Sapporo criteria

In Korean patients with APS, the concordance rate between the 2023 ACR/EULAR criteria and the 2006 revised Sapporo criteria was high. The concordance rate was considerably lower when confined to patients with obstetric APS. The 2023 ACR/EULAR criteria are stricter, particularly for obstetric events; its emphasis on specificity may result in the exclusion of patients with clinically significant obstetric APS.