摘要目的:建立本实验室血清孕酮同位素稀释液相色谱串联质谱（ID-LC-MS/MS）候选参考方法，并将其用于5种临床常规检测系统的性能评价，探讨不同检测系统检测血清孕酮的可比性。方法:采用液液萃取的方法进行样本前处理，在正离子质谱模式下的反相液相分离检测人血清中孕酮，通过梯度洗脱，使单个样本检测时间控制在5 min内。为提高方法准确度，使用包括法建立标准曲线，根据美国临床和实验室标准化协会C62-A、EP15-A2、EP6-A2和EP9-A3等文件分别评价包括法和经典校准曲线法检测的灵敏度、正确度、精密度和特异度等性能，并评价5个血清孕酮临床常规检测系统的检测性能，与ID-LC-MS/MS法比较，评估其在医学决定水平2和25 ng/ml处的偏倚是否均<1/2允许总误差（TEa，12.5%）。结果:本实验室血清孕酮ID-LC-MS/MS候选参考方法检测限为0.005 ng/ml，包括法和经典校准曲线法回收实验的回收率分别为97.95%~101.58%和96.88%~110.70%，包括法对认证标准物质的测量结果在其声明的不确定度范围内；包括法批内、批间变异系数（ CV）均<3.0%，优于经典校准曲线法（2.48%~9.33%）。5种临床常规检测系统的精密度和线性范围均能达到要求；检测系统1、3和5在2和25 ng/ml处2个医学决定水平的测量结果偏倚不满足均<1/2TEa，检测系统2和4在2个医学决定水平的测量结果偏倚均<1/2TEa。 结论:本室建立的血清孕酮ID-LC-MS/MS候选参考方法分析性能符合要求，包括法较经典校准曲线法具有更好的检测性能；5种临床常规检测系统的精密度、线性评估良好，仅2个检测系统在2个医学决定水平的正确度评价能满足临床需求。

abstractsObjective:To establish a candidate reference method for serum progesterone using isotope dilution liquid chromatography tandem mass spectrometry (ID-LC/MS/MS) in our laboratory, validate the analytic performance of five clinical routine detection systems to explore the comparability of serum progesterone detection by different detection systems.Methods:A candidate reference method for serum progesterone using ID-LC/MS/MS method was established. The sample was pretreated by liquid-liquid extraction method, and the reversed phase liquid phase separation in positive ion mass spectrometry mode was used to detect progesterone in human serum, and the detection time of a single sample was controlled within 5 minutes by gradient elution. In order to improve the accuracy of the method, the bracketing calibration method (BCM) was used to establish the standard curve. The sensitivity, accuracy, precision and specificity of BCM and classical calibration curve method were evaluated according to CLSI C62-A, EP15-A2, EP6-A2 and EP9-A3, and the analytical performance and comparability of five clinical routine progesterone detection systems were evaluated,compared with ID-LC/MS/MS method, the bias at medical decision level 2 and 25 ng/ml was evaluated to see if they were <1/2TEa (12.5%).Results:The limit of detection (LOD) of ID-LC/MS/MS was 0.005 ng/ml. The recoveries of BCM method and classical calibration curve method are 97.95%-101.58% and 96.88%-110.70%, respectively. The measurement results of BCM method for certified reference materials are within its declared uncertainty range. The intra-and inter-assay coefficient of variation ( CV) of BCM method was less than 3.0%, which was better than that of classical calibration curve method ( CV: 2.48%-9.33%). The precision and linear range of the five clinical routine detection systems can meet the detection requirements. The measurement bias of detection system 1, 3 and 5 at 25 ng/ml of medical decision level was less than 1/2TEa, and the measurement bias at 2 ng/ml of medical decision level was more than 1/2TEa. The measurement bias of detection system 2 and 4 at two medical decision levels was less than 1/2TEa. Conclusion:The candidate reference method for serum progesterone ID-LC/MS/MS established in our laboratory meets the requirements of the reference method. BCM has better detection performance than classical calibration curve method. The precision and linearity of the five progesterone clinical detection systems are satisfactory. The five clinical detection systems could meet the clinical requirements at the medical determination level of 25 ng/ml, however, only two of the five clinical detection systems meet the clinical requirements at the medical determination level of 2 ng/ml.