Analytical and Clinical Validation of a Remote Laboratory Test for Prothrombin Time and INR Determination in Patients with Antiphospholipid Antibody Syndrome and Systemic Lupus Erythematosus

< 0.0001), while Bland-Altman analysis indicated a bias of 0.26 INR units. The presence of antiphospholipid antibodies appears to interfere with PT/INR measurements obtained by the bSens.INR, reducing accuracy in APS and SLE patients. Although the device shows promising performance, its use in autoimmune populations should be approached with caution, reinforcing previous findings on the limitations of RLT in these conditions.