检验医学 ›› 2018, Vol. 33 ›› Issue (10): 899-902.DOI: 10.3969/j.issn.1673-8640.2018.10.006

• 临床应用研究∙论著 • 上一篇    下一篇

抗结核分枝杆菌多表位融合抗原IgG抗体检测最佳临界值的建立和初步应用

戚应杰1, 石玉如1, 刘婷1, 岳莉1, 赵长城1, 王云1, 马筱玲2   

  1. 1. 安徽省立医院感染病院检验科,安徽 合肥 230022
    2. 安徽省立医院,安徽 合肥 230022
  • 收稿日期:2017-10-27 出版日期:2018-10-30 发布日期:2018-10-23
  • 作者简介:null
    作者简介:戚应杰,男,1974年生,硕士,主任技师,主要从事感染性疾病的实验室诊断及研究。
  • 基金资助:
    合肥市应用医学研究项目(hkw2016yb012)

Establishment and preliminary application of optimal cut-off value of anti-multi-epitope fusion antigen IgG antibody of Mycobacterium tuberculosis

QI Yingjie1, SHI Yuru1, LIU Ting1, YUE Li1, ZHAO Changcheng1, WANG Yun1, MA Xiaoling2   

  1. 1. Department of Clinical Laboratory,Infectious Disease Hospital of Anhui Provincial Hospital,Hefei 230022,Anhui,China
    2. Anhui Provincial Hospital,Hefei 230022,Anhui,China
  • Received:2017-10-27 Online:2018-10-30 Published:2018-10-23

摘要:

目的 建立抗结核分枝杆菌多表位融合抗原IgG抗体(MTB-Ab)检测的最佳临界值,评价该项目对肺结核的诊断性能。方法 采用酶联免疫吸附试验(ELISA)检测62例活动性肺结核患者、58例非活动性肺结核患者和168名体检健康者(正常对照组)血清MTB-Ab,采用受试者工作特征(ROC)曲线确定最佳临界值并将其设为Cut-off值指数(COI),分别评价试剂盒推荐的Cut-off值和最佳COI值对肺结核和活动性肺结核的诊断性能。结果 以正常对照组为对照,MTB-Ab诊断肺结核的最佳COI值(COI1)为0.90,此时敏感性为92.5%,显著高于试剂盒Cut-off值(0.18)的敏感性(86.7%)(P<0.05)。试剂盒Cut-off值与COI1诊断肺结核的特异性、约登指数、阳性似然比、阴性似然比、阳性预测值和阴性预测值差异均无统计学意义(P>0.05)。以非活动性肺结核组为对照,MTB-Ab诊断活动性肺结核的最佳COI值(COI2)为3.65,其敏感性、特异性、约登指数、阳性似然比、阳性预测值、阴性预测值均低于COI1P<0.05),而阴性似然比高于COI1P<0.05)。结论 以正常对照者为对照得出的最佳COI值(COI1)作为判断限,可以提高MTB-Ab诊断肺结核的敏感性。以非活动性肺结核患者为对照得出的最佳COI值(COI2)作为判断限,MTB-Ab鉴别诊断活动性与非活动性肺结核的性能均明显下降。

关键词: 酶联免疫吸附试验, 结核抗体, 诊断性能

Abstract:

Objective To establish an optimal cut-off value of anti-multi-epitope fusion antigen IgG antibody of Mycobacterium tuberculosis(MTB-Ab),and to evaluate the diagnostic efficiency for pulmonary tuberculosis. Methods MTB-Ab was determined by enzyme-linked immunosorbent assay (ELISA)in 62 patients with active pulmonary tuberculosis,58 patients with inactive pulmonary tuberculosis and 168 healthy subjects (healthy control group). The optimal cut-off value was confirmed as cut-off index (COI) by receiver operating characteristic (ROC) curve. The diagnostic efficiency of the cut-off value recommended by kit and optimal COI on pulmonary tuberculosis and active pulmonary tuberculosis was evaluated. Results Using healthy control group as control,the optimal COI1 of MTB-Ab for the diagnosis of pulmonary tuberculosis was 0.90,and the sensitivity was 92.5%,which was higher than the sensitivity for the cut-off value(0.18) recommended by kit (86.7%)(P<0.05). There was no statistical significance for specificity,Youden index,positive likelihood ratio,negative likelihood ratio,positive predictive value and negative predictive value between the cut-off value recommended by kit and COI1 for the diagnosis of pulmonary tuberculosis (P>0.05). Using inactive pulmonary tuberculosis group as control,the optimal COI2 was 3.65,the sensitivity,specificity,Youden index,positive likelihood ratio,positive predictive value and negative predictive value were lower than those of COI1P<0.05),and negative likelihood ratio was higher(P<0.05). Conclusions Using healthy control group as control,the COI1 of MTB-Ab as the cut-off value could improve the diagnostic sensitivity of pulmonary tuberculosis. Using inactive pulmonary tuberculosis group as control,the diagnostic efficiency of COI2 for active and inactive pulmonary tuberculosis decreases.

Key words: Enzyme-linked immunosorbent assay, Tuberculosis antibody, Diagnostic efficiency

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