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目的探讨患者血清降钙素原水平对区分革兰阴性菌与革兰阳性菌引起的血流感染的临床意义。方法通过对69份血培养阳性结果及其相应的血清降钙素原测定值分为G+组和G-组，分析患者血清降钙素原水平，以<0.05为有统计学意义。结果两组数据采用秩和检验，G+组秩和为29，G-组秩和为181，<0.05，差异有统计学意义，再据此做受试者工作特征曲线表明在pct值取0.64ng/ml时，灵敏度为70.8%，特异性为60.0%。结论血清降钙素原水平有助于快速区分G+菌与G-菌所致的血流感染。“,”Objective Discuss distinguish between procalcitonin original level in patients with gram-negative bacterium and gram-positive bacterium of bloodstream infections caused by clinical significance. Methods Based on 69 blood culture positive results and corresponding serum calcitonin original measurements into G+ groups and G- groups.Analysis of patients with serum calcitonin level, with <0.05 for statistical significance. Results Two sets of data using the rank sum test,G+group rank of 29, G-group rank of 181, <0.05, the dif erence was statistical y significant, then the receiver operating characteristic curve accordingly do indicate the value in taking 0.64ng pct when / ml, the sensitivity was 70.8% and specificity of 60.0%. Conclusion Serum procalcitonin levels helps to quickly distinguish between G+and G-bacteria bloodstream infections caused by bacteria.