混合人血清中总甲状腺素标准物质的研制

摘要

目的：研制冰冻人血清中总甲状腺素标准物质。方法募集年龄20～50岁的健康志愿者13名，男7名，女6名，采集志愿者血清，根据甲状腺素的浓度制备4种不同水平的混合血清池。用常规方法进行均匀性和同步稳定性研究。用同位素稀释液相色谱串联质谱（ ID-LC／MS／MS）为甲状腺素定值，并计算不确定度。用ID-LC／MS／MS法和4种常规方法同时分析4种候选标准物质，研究此物质的互通性。结果4种候选标准物质的研究结果显示均匀性良好，在-70℃保存至少可稳定1年，在4种常规系统上互通性良好。定值结果（“标准值±扩展不确定度”，单位：nmol／L）分别为：75．9±1．8，105．3±2．2，114．7±2．1，187．4±2．9。结论研制的血清甲状腺素标准物质均匀、稳定，定值可靠，已被批准为国家一级标准物质（ GBW 09127、GBW 09128、GBW 09129和GBW 09130）。（中华检验医学杂志，2016，39：40-44）%Objective To prepare the serum reference materials for total thyroxine .Methods Individual blood samples were collected from 13 healthy donors (7 males and 6 females) aged from 20 to 50 years old, and the sera were separated and mixed into 4 serum pools according to the concentration of thyroxine.The materials were tested for homogeneity and stability using routine methods .The method of isotope dilution liquid chromatography tandem mass spectrometry ( ID-LC/MS/MS) was used to determine the concentration of thyroxine .The candidate reference materials were also measured by four conventional methods to analyze the commutability of the materials .Results It showed that the four candidate reference materials were homogeneous and commutable in four conventional methods and they were tested to be stable for at least 1 year at -70 ℃using the isochronous stability study .The certified values ( reference value ± expanded uncertainty ,nmol/L) were:75.9 ±1.8,105.3 ±2.2,114.7 ±2.1 and 187.4 ±2.9.Conclusions Certified reference materials for serum thyroxine have been prepared .These materials have been approved to be the Certificate Reference Materials of GBW 09127,GBW 09128,GBW 09129 and GBW 09130.