Individual subject responses at peptide levels to preanalytical variations in blood sample processing. Subjects 6, 12, 14, and 19 showed more sensitive response to storing plasma at 4 °C for 24 h than other conditions or subjects in terms of the peptides from fibrinogen alpha chain. The abbreviations Lowxg, B6h0C, B6hRT, P24h4C, and P24hRT represent a low centrifugation force (1300g), blood incubation at 0 °C for 6 h, blood incubation at RT for 6 h, plasma incubation at 4 °C for 24 h, and plasma incubation at RT for 24 h, respectively.