PTX3 and systemic lupus erythematosus: The PTX3 concentrations in the blood of patients with TA (median 5.5 ng/ml, range 1.3 to 55 ng/ml) and SLE (median 5.1 ng/ml, range 0.7 to 9.2 ng/ml) were significantly higher than those in healthy controls (median 3.9 ng/ml, range 1.4 to 6.5 ng/ml, P = 0.009 and 0.017 respectively).