The best cut-off point of procalcitonin to detect patients who had or did not have death was 4 ng / ml, with sensitivity of 81.3%, specificity of 92.7%, positive predictive value (PPV) of 91.76%, and negative predictive value (NPV) of 83.2%. Conclusion: There was a correlation between blood procalaitonin concentration and CAP level according to PORT classification.