CALCA and infection: Thus, PCT levels above 0.50 ng/ml on ICU admission (day 0) or 1.17 ng/ml on postoperative day 1 were associated with a two- and three-fold increase in the risk of infection: OR 2.65; 95%CI (1.34–5.25) and OR 3.21; 95%CI (1.62–6.39), respectively.