[1]谭玉华,马有成,王春波,等.全自动时间分辨荧光免疫分析检测新生儿滤纸血斑甲状腺素(T4)改良竞争法的建立与评价[J].现代检验医学杂志,2026,41(05):31-39.[doi:10.3969/j.issn.1671-7414.2026.05.006]
 TAN Yuhua,MA Youcheng,WANG Chunbo,et al.Establishment and Evaluation of a Modified Competitive Method for Detecting Thyroxine (T4) in Neonatal Dried Blood Spots by Fully Automatic Time- Resolved Fluoroimmunoassay[J].Journal of Modern Laboratory Medicine,2026,41(05):31-39.[doi:10.3969/j.issn.1671-7414.2026.05.006]
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全自动时间分辨荧光免疫分析检测新生儿滤纸血斑甲状腺素(T4)改良竞争法的建立与评价()

《现代检验医学杂志》[ISSN:/CN:]

卷:
第41卷
期数:
2026年05期
页码:
31-39
栏目:
论著
出版日期:
2026-09-15

文章信息/Info

Title:
Establishment and Evaluation of a Modified Competitive Method for Detecting Thyroxine (T4) in Neonatal Dried Blood Spots by Fully Automatic Time- Resolved Fluoroimmunoassay
文章编号:
1671-7414 (2026) 05-031-09
作者:
谭玉华1,马有成2,王春波1,徐思滢1,郑丹3,余海枷1,冯健明1
(1.广州市丰华生物股份有限公司体外诊断试剂研发中心,广州510730;2.成都市妇女儿童中心医院新生儿疾病筛查中心,成都610000;3.中山大学附属第一医院医学检验科,广州510080)
Author(s):
TAN Yuhua1, MA Youcheng2, WANG Chunbo1, XU Siying1, ZHENG Dan3, YU Haijia1, FENG Jianming1
(1.In vitro Diagnostic Reagent Research and Development Center, Guangzhou Fenghua Biotech Co.,Ltd., Guangzhou 510730, China; 2.Neonatal Disease Screening Center, Chengdu Women and Children’s Central Hospital, Chengdu 610000, China; 3.Department of Medical Laboratory, the First Affiliated Hospital of Sun Yat-sen University, Guangzhou 510080, China)
关键词:
时间分辨荧光免疫分析;  滤纸干血片;  甲状腺素;  竞争法
分类号:
R581.2; R446.61
DOI:
10.3969/j.issn.1671-7414.2026.05.006
文献标志码:
A
摘要:
目的 建立一种全自动时间分辨荧光免疫分析 (TRFIA) 检测新生儿滤纸干血片 (DBS) 甲状腺素 (T4) 改良竞争法, 并评价其性能。 方法 T4 竞争法配对单克隆抗体 (包被抗体) 包被微孔板作为反应板, 铕标记T4 单克隆抗体 (抗T4) 作为铕 标记物, 应用全自动TRFIA定量检测板针固定滤纸血斑中T4 浓度, 对其分析灵敏度、 准确度、 线性、 精密度、 特异度、 色谱 效应、 基质效应、 回收试验、 体积效应、 红细胞压积效应和稳定性等性能指标进行评价。 选择120份同源的血清样品和DBS 样品, 用于自建方法与T4 化学发光法的比对试验。 收集新生儿足跟血DBS剩余样品312份, 用于T4 和促甲状腺素 (TSH) 联 合检测。 结果 空白限为0.44μg/dl血清, 检出限为0.81μg/dl血清, 定量限为1.61μg/dl血清, 检测标准参考物质的相对 偏差在-5.33%~1.83%间; 在1.61~50.00?g/dl血清范围内, r可达0.999 6; 批内、 批间、 重复性、 实验室内和实验室间变异系 数 (CV) 均在6.00%内; 检测9种高浓度的交叉物的反应率在0.021%~1.980%内, 检测20?g/dl的D-T4 DBS样品的交叉反 应率为43.900%; 9种高浓度的干扰物质对T4 检测结果的干扰率均在±10%以内。 边缘打孔的血斑检测结果高于中央、 中 央至边缘1/2处打孔检测结果 (t=4.44、 5.26, 均P?0.05) ; 3个不同批次的903滤纸制作的DBS样品实测值与理论值的相对 偏差均在允许范围 (±15.00%) 内; 回收率在91.64%~104.07%间; 与50μl/滴制备的DBS样品检测结果比较, 其他点样体 积制备的DBS样品检测结果的差异具有统计学意义 (均P<0.05) ; 在35%~60%红细胞压积下制得DBS样品较50%红细胞 压积制得DBS样品的检测结果的相对偏差均在±15%内; -20℃下标记物可反复冻融4次, 试剂在2~8℃下可保存14个月, 试剂在37±1℃下可保存9天。 在2.07~36.11?g/dl血清内, 自建方法与对比方法检测结果高度相关 (r=0.995 5, tr=112.73, P<0.05) ; 检出率差异无统计学意义 (χ2 =0.50、 0.50, 均P>0.05) 。 新生儿DBS样品T4 的平均浓度为18.90?g/dl血清, T4 与TSH 的检出率差异具有统计学意义 (χ2 =11.56、 16.52, 均P<0.05) 。 结论 自建方法具有灵敏度高、 准确度好、 线性范围宽、 精密 度好和特异度高等优点, 与对比方法检测结果具有高度的相关性和一致性, 满足临床检测需求。
Abstract:
Objective To establish and evaluate a fully automatic time-resolved fluoroimmunoassay (TRFIA) based on a modified competitive method for detecting thyroxine (T4) in neonatal dried blood spots (DBS). Methods Microplates coated with T4 competitive-method paired monoclonal antibody (capture antibody) were used as the solid phase. Europium (Eu)-labeled T4 monoclonal antibody (anti-T4) was used as the tracer. The fully automatic TRFIA system was applied to quantitatively detect the T4 concentration in the blood spots on the ?lter paper ?xed onto plate needles. The analytical performance indicators, including sensitivity, accuracy, linearity, precision, specificity, chromatographic effect, matrix effect, recovery test, volume effect, hematocrit effect, and stability, were evaluated. 120 paired serum and DBS samples were selected for the comparison test between the self-developed method and the T4 chemiluminescence method. Residual DBS samples from 312 newborns were used for combined T4 and thyroid- stimulating hormone (TSH) detection. Results The limit of blank was 0.44 μg/dl serum, the limit of detection was 0.81μg/dl serum, and the limit of quanti?cation was 1.61 μg/dl serum. The relative deviations for certi?ed reference materials ranged from -5.33% to 1.83%. Excellent linearity was observed within the range of 1.61~50.00 ?g/dl serum (r=0.999 6). The intra-assay, inter-assay, repeatability, laboratory and inter-laboratory coe?cients of variation (CV) were all within 6.00%. The cross-reactivity rates for nine high-concentration cross-reaction substances ranged from 0.021% to 1.980%, and the cross-reactivity rate for 20?g/ dl D-T4 DBS sample was 43.900%. The interference rates of nine high-concentration interfering substances on T4 measurements were all within ±10%. Blood spots punched from the edge yielded higher results than those punched from the center or from the midpoint between the central and edge (t=4.44, 5.26, both P<0.05). The relative deviations between measured and theoretical values for DBS samples prepared with three different batches of 903 ?lter paper were all within the acceptable range (±15.00%). Recovery rates ranged from 91.64% to 104.07%. Compared with DBS samples prepared at a volume of 50 μL/drop, those prepared at other volumes showed statistically significant differences (all P<0.05). The relative deviations for DBS samples prepared at hematocrit levels of 35% to 60% compared with those at 50% were all within ±15%. The Eu-marker could withstand up to four freeze-thaw cycles at -20 ℃ , and the reagent could be stored at 2 to 8 ℃ for 14 months and at 37 ± 1 ℃ for 9 days. Within the range of 2.07~36.11 ?g/dl serum, the results of the established method showed a strong correlation with those of the comparator method (r=0.995 5, tr=112.73, P<0.05), with no statistically signi?cant difference in detection rates between the two methods (χ2 =0.50 and 0.50, both P>0.05). The average concentration of T4 in neonatal DBS samples was 18.90 ?g/dl serum. The detection rates of T4 and TSH differed significantly (χ2 =11.56 and 16.52, all P<0.05). Conclusions The established method demonstrates high sensitivity, good accuracy, wide linear range, excellent precision and high specificity. It shows strong correlation and consistency with the comparative method, and meets the requirements for routine clinical testing.

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备注/Memo

备注/Memo:
作者简介: 谭玉华(1980-),男,医学硕士,医疗器械高级工程师、临床医学检验技师、二级企业培训师、三级健康管理师,主要从事医疗器械
更新日期/Last Update: 2026-09-15