乳胶增强免疫散射比浊法检测血清淀粉样蛋白A的应用评价

Application evaluation of latex-enhanced immunonephelometry method to determine serum amyloid A

目的建立乳胶增强散射免疫比浊法检测血清淀粉样蛋白A（SAA）的即时检验（POCT）方法，并对该法的精密度、线性、准确度等进行评价。方法建立乳胶增强免疫比浊法测定SAA的POCT方法，并根据美国临床实验室标准化协会（CLSI）相关文件对建立的POCT方法进行方法学评价。结果本法的分析灵敏度为3．52m∥L；批内变异系数（CV）〈8％、日问CV〈10％；抗干扰性较强，血红蛋白≤4．0g／L、胆红素≤400μmol／L、类风湿因子≤1621U／L、甘油三酯≤10mmol／L对测定无影响；与进口N Latex SAA试剂相关性良好（Y=1．0521 X＋0．0015，r=0．9983）；线性范围为5～200mg／L。结论本法具有简单、快速（3min内完成检测）的特点，各项分析指标均符合要求，可用于临床患者血清标本的检测。

Objective To establish the analysis performance of serum amyloid A(SAA) detected by latexenhanced immunonephelometry method with point-of-care test(POCT),and to evaluate precision,linearity,accuracy and so on. Methods According to relevant documents of the Clinical and Laboratory Standards Institute(CLSI),the methodological evaluation was performed. Results The sensitivity of this method was 3. 52 mg / L. The within-run and inter-day coefficients of variation(CV) of this method were < 8% and < 10%,respectively,with strong antiinterference ability. When the level of hemoglobin was ≤4. 0 g / L,the level of bilirubin was ≤400 μmol / L,the level of rheumatoid factor was ≤1 621 U / L,and the level of triglyceride was ≤10 mmol / L,there was no influence on the results. There was a good correlation with that of imported N Latex SAA assay(Y = 1. 052 1X + 0. 001 5,r = 0. 998 3).The detection linear range of this method was 5-200 mg / L. Conclusions The latex-enhanced immunonephelometry method for SAA is convenient,and it can be finished within 3 min. Its performance meets the requirements for in vitro diagnostic reagents,and it is suitable for the detection of serum samples in clinical use.