OBJECTIVES: The purpose of our study was to compare community-acquired pneumonia (CAP) patients who were and were not ad -ministered treatment in accordance with the Turkish Thoracic Society (TTS) 2009 pneumonia guideline in terms of hospital stay length,treatment cost, and treatment effcacy.MATERIAL AND METHODS: Patients who were admitted to our hospital and who were diagnosed with CAP were included in the study. Demo-graphic characteristics of the patients, symptoms at the time of diagnosis, physical examination, laboratory and radiological fndings, treatments,response to treatment at follow-up, length of hospital stay, and direct cost of treatment were recorded in the TTS pneumonia database (TURCAP: TUR-KEY Community Acquired Pneumonia). Taking into consideration the Turkish Thoracic Society Consensus Report on the Diagnosis and Treatmentof Community-acquired pneumonia in Adults (2009), the patients recorded in the database were evaluated in terms of conformity to the guideline.RESULTS: This present study included 156 patients diagnosed with CAP. Sixty-six patients (42.3%) were females, and 96 (57.7%) weremales, and the mean age of the patients was 70.4 years. The most common symptoms on admission were cough (94.9%), expectorationof purulent sputum (77.6%), and fever (58%). Comorbid diseases were chronic obstructive pulmonary disease (COPD; 29.5%), asthma(3.2%), lung cancer (8.3%), cardiovascular diseases (32.7%), and diabetes mellitus (12.8%). It was observed that 67.3% of the patientsreceived treatment in accordance with the guideline. No signifcant difference was found in terms of gender and symptoms between thegroups that received and did not receive treatment in accordance with the guideline. The mean age of the patients who received treat-ment according to the guideline was higher than that of the patients who did not receive treatment according to the guideline; COPDwas more frequent in the group of patients who received treatment according to the guideline. Pneumonia Severity Index and Confusion,Urea, Respiratory rate, Blood pressure-Age>65 scores of the patients who were treated according to the guideline was higher and treat-ment resulted in death in 8% of these patients.CONCLUSION: Hospital stay length, treatment cost, and treatment effcacy were similar in patients who were and were not administeredtreatment in accordance with the guideline.