Figure 1.

CH50 (top left panel), AP50 (bottom left panel) and C3d (bottom right panel) kinetics in Serum on ice (dark grey) vs. RT (light grey) and EDTA plasma at RT (black). Symbols and error bars represent the mean and standard error of mean of five healthy volunteers. Reference intervals and cut-off are indicated as dotted lines. RT - room temperature. URL - upper reference limit. LRL - lower reference limit. CH50 - total haemolytic (or classical) complement activity. AP50 - alternative pathway com-plement activity. C3d - nephelometric quantitation of C3 split product, C3d.