Abstract: Abstract : Objective To study C-reactive protein (CRP) measurement in elderly patients with community-acquired pneumonia diagnosis and antibiotic use in the clinical value. Methods Detected C-reactive protein in 50 elderly patients with community-acquired pneumonia in patients before treatment and 3 days 7 days after treatment , and C-reactive protein with the same period 50 cases of non-infectious diseases in hospitalized elderly patients .Results community-acquired pneumonia in patients before treatment with non-infected patients were significantly different (P <0.05); treatment 3 days before and after treatment were significantly different (P <0.05); treatment after 3 days and 7 days after treatment compared with significantly different (P <0.05); treatment 7 days before and after treatment were significantly different (P <0.05); treatment after 7 days compared with the control group no significant difference (P> 0.05). Conclusion C-reactive protein can be used as a diagnostic elderly community-acquired pneumonia and a sensitive indicator of therapeutic effect, but also could serve as a guide clinical timely, correct or adjust the use of an indicator of efficacy of antibiotics.

Key words: C-reactive protein, community-acquired pneumonia, the elderly