Reactivity of SLE/APS patient samples from cohort 2 in two different anti-β2GPI assays.

172 patient samples with suspected APS (including 51 SLE patients) were tested for reactivity against coated β2GPI in assay A and assay B. Results are shown for the 23 domain I-reactive samples. Samples were considered strong positive (+++), positive (++) and weak positive (+) according to the recommendations of the manufacturers.1Antibody reactivity against domain I of β2GPI, as described previously [6].