游离三碘甲腺原氨酸(FT3)生物素-亲合素酶联免疫分析

采用T3抗体包被酶标板微孔、生物素化T3和辣根过氧化物酶(HRP)标记链亲合素作为信号放大体系,一系列定量游离T3(FT3)为标准品,并以四甲基联苯胺-过氧化氢为显色底物,建立了FT3的生物素-亲合素(BA)酶联免疫分析(FT3-BA-EIA)法。其灵敏度为0.90pmol/L,标准曲线范围0.9～45.0pmol/L,批内变异系数3.1%～8.1%,批间变异系数4.9%～10.6%。测定了101例临床血样,其中正常人46例,实测范围2.5～11.1pmol/L,均值为5.1±2.0pmol/L;27例甲亢病人,实测范围9.7～37.3pmol/L,均值为20.5±7.1pmol/L;20例甲低病人,实测范围0.9～3.8pmol/L,均值为2.0±0.9pmol/L;8例孕妇,实测范围为3.4～8.5pmol/L,均值为6.0±2.5pmol/L。通过对临床血样的检测,本法与化学发光法(CIA)及放免法(RIA)的测定结果有良好的相关性。应用本法可有效地诊断甲状腺疾病,具有操作简便、灵敏、快速的特点,适于临床检测和科研应用。

Establishment of An Enzyme Linked Immunosorbent Assay for Free Triiodothyronine(FT3)

The methodology for determining FT3 in serum to estimate the patients with thyroidal and related diseases is established. In this new solid-phase antibody enzyme immunoassay, biotinylated T3 and HRP-streptavidin conjugate are used. The detection limit is low (0.90 pmol/L), the measurable range is 0.9 to 45.0 pmol/L, The intra- and inter-assay CVs are 3.1%~8.1% and (4.9)%~10.6%, respectively. FT3 values are obtained with this assay for 101 samples. The FT3 concentrations range is from 2.5~11.1 pmol/L in 46 euthyroid subjects, 9.7~37.3 pmol/L in 27 hyperthyroid patients, and 0.9~3.8 pmol/L in 20 hypothyroid patients and 3.4~8.5 pmol/L in 8 pregnalcy, respectively. Comparing with CIA and RIA, the clinical results correlated well. The method is suitable for clinical and research application.