359 patient-days included in the study Evaluation of the use of PCT, CRP and leukocyte countto classify: absence of infection, SRIS, localized infection,sepsis, severe sepsis and septic shock  Area under thereceiver operating characteristic (ROC) curve for diagnosis ofsepsis was 0.532 for leukocyte count, 0.75 for CRP and 0.912 forPCT. Here, CALCA is linked to infection.