SELP and systemic lupus erythematosus: The percentage of platelet/leukocyte aggregate correlated with the ROTEM® parameters MCF (Spearman r = 0.579, p = 0.030) and alpha angle (Spearman r = 0.532, p = 0.031) and with the basal P-selectin exposure on the platelet surface (Spearman r = 0.429, p = 0.035), but did not correlate with the platelet and leukocyte counts.The platelet activation in patients with SLE did not depend on the platelet count.