CRP and chronic obstructive pulmonary disease: In the study that was conducted by Saltürk et al., patients that were hospitalized in intensive care due to COPD exacerbation were divided into two groups—eosinophilic and non-eosinophilic—and the NLR, CRP levels, and the length of stay in intensive care were higher in the non-eosinophilic group [25].