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目的：观察降钙素原（PC T ）检测在老年急性阑尾炎诊治中的临床意义。方法采用免疫荧光法对52例老年急性阑尾炎患者（阑尾炎组）和30例非感染性疾病老年患者（对照组）进行血浆PCT水平检测，PCT≥0.5 ng／ml判定为阳性。阑尾炎组中，急性单纯性阑尾炎9例（单纯组），急性化脓性阑尾炎19例（化脓组），坏疽或穿孔性阑尾炎24例（坏疽穿孔组）。结果阑尾炎组PC T阳性比例高于对照组（P＜0．05）；坏疽穿孔组和化脓组PCT阳性比例高于单纯组（P＜0．05）；单纯组与对照组或坏疽穿孔组与化脓组之间PCT阳性比例差异均无统计学意义（P＞0．05）。结论血浆PC T定量检测有助于老年急性阑尾炎的诊断及其炎症程度的评估。“,”Objective To analyze the clinical significance of procalcitonin (PCT ) detection in the diagnosis and treatment of elderly patients with acute appendicitis .Methods Plasma PCT concentration was detected by immunofluorescence assay in 52 elderly patients with acute appendicitis (group A) including acute simple appendicitis (group A1 ,9 cases) ,acute suppurative appendicitis (group A2 ,19 cases) and gangrenous or perforated appendicitis (group A3 ,24 cases) .Thirty elderly patients with non‐infectious diseases were taken as the controls (group C) .Plasma concentration of PCT≥0.5 ng/ml was defined as positive result .Results The percentage of patients with plasma PCT positive result in group A was significantly higher than that in group B (P<0 .05) ,which in groups of A2 and A3 was significantly higher than that in group A1 ( P0 .05) .Conclusion The detection of PCT in plasma is helpful in the diagnosis and evaluation of inflammatory degree in elderly patients w ith acute appendicitis .