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[目的]探讨血清降钙素原(PCT)、乳酸(LA)和脑钠肽(BNP)在老年社区获得性肺炎诊断和预后评估中的价值.[方法]选择2015年5月至2016年7月本院收治的老年社区获得性肺炎82例(观察组),以本院同期行健康体检的志愿者80例为对照组.检测并比较两组血清PCT、LA和BNP水平.[结果]观察组血PCT、LA和BNP水平分别为(0.99±0.42)μg/L、(3.90±1.09)mmol/L、(159.26±19.80)pg/mL,均明显高于对照组(0.17±0.31)μg/L、(0.92±0.33)mmol/L、(50.01±13.40)pg/mL,其差异均具有统计学意义(PBNP,特异性:PCT>LA>BNP,PCT+LA+BNP联合诊断时的灵敏度和特异性均高于单一指标诊断(P BNP.Combination of calcitonin,lactate,and BNP was higher than single index (P<0.05).[Conclusion] The levels of serum procalcitonin, lactate and BNP are closely related to the development and prognosis of community-acquired pneumonia in elderly patients.Combined use of these three indexes can further improve the application value.