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[目的]探讨真空采血管和标本放置时间的不同对急诊患者电解质检测结果产生的影响。[方法]使用肝素锂抗凝管和普通促凝真空管，同时抽血后分别于放置0．5、1、2 h时进行检测，观察两者不同时刻检测的结果。[结果]在0．5和1 h时，血浆组中K＋和Na＋浓度均明显低于血清组（P＜0．05）。随着标本放置时间的延长，血浆组中K＋和Na＋浓度有增高趋势，并在2 h时差异有统计学意义（ P＜0．05）。血清组中K＋、Na＋和Cl-的浓度不同时刻无明显差异（P＞0．05），但随着放置时间的延长，血浆组和血清组的CO2水平均明显下降，且差异有统计学意义（ P＜0．05）。[结论]使用不同的真空采血管对电解质的检测结果有影响。随着标本放置时间的延长，血浆组K＋和Na＋的测量值升高，血浆组和血清组CO2的测量值则都下降。“,”Objective] To study the effect of different placed time for vacutainer and specimen on the results of emergency electrolyte detection . [ Methods] With heparin lithium anticoagulation tube and common coagulation vacuum tube , electrolytes were detected at 30 minutes,one hour and two hours af-ter extracting blood . [ Results] At 30 minutes and one hour after extracting blood ,the levels of K +and Na+of the plasma group were significantly lower than those of the serum group (P<0.05).With the ex-tension of specimen placed time , the levels of K +and Na +of the plasma group were becoming higher than those previously ,and at two hours the difference had statistical significance ( P0.05).But the levels of CO2 of both the plasma group and the serum group were significantly lower than those previously with the extension of specimen placed time , and the difference had statistical significance (P<0.05). [Conclusion] It is indicated that the using of different vacutainers effects electrolyte de-tection.With the extension of specimen placed time , the levels of K +and Na +of the plasma group increase gradually , and the levels of CO 2 of the plasma group and the serum group both decrease gradually .