Plasma SAA (A) and CRP (B) levels were measured for 113 VTE patients and 113 age and sex matched controls using standard ELISA methods. Solid thick lines indicate median values and the dotted lines indicate values for the 90th percentile of the control values. VTE patients had significantly higher levels of SAA compared to the matched controls (2.12 μg/ml, interquartile range (IQR) 1.66 to 3.22 μg/ml) versus 3.70 μg/ml (IQR 2.27 to 6.54 μg/ml) (p<0.0001, Mann-Whitney test). In contrast, there was no statistical difference in CRP levels between VTE (2.20 mg/L, IQR 0.95 to 5.46 μg/ml) and control (1.68 μg/L, IQR 0.85 to 4.11 μg/ml) (p=0.23, Mann-Whitney test).