Highlights ■ Only 34.4% of patients with primary Antiphospholipid Syndrome achieved adequate anticoagulation  (time in therapeutic range ≥60%). ■ More than half had insufficient INR monitoring, precluding  time in therapeutic range calculation. ■ No clinical or demographic factors were associated with  poor anticoagulation control. ■ Gaps in follow-up and adherence issues appear to be key contributors to suboptimal anticoagulation. ABSTRACT Objective: This study aimed to evaluate the quality of anticoagulation control in patients with primary antiphospholipid syndrome, using time in […]