CRP and ventilator-associated pneumonia: In addition to clinical and microbiological data, some studies hypothesise that CRP and procalcitonin can be used to diagnose VAP.30-32 However, additional contradictory studies have also been reported.33 Accordingly, no statistically significant differences were identified between VAP (+) and VAP (-) patients in terms of CRP and procalcitonin values in our study.