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对甲状腺疾病的诊断,目前国外所用有关放射免疫分析试剂盒约有10余种,为了更准确反映甲状腺机能状态,近几年开展了游离甲状腺素(FT~4)的测定,但其操作繁杂,不适于临床应用。1970年Clark等提出用~(125)I-T_3树脂吸收比值(RT_3U)乘以TT_4求出游离甲状腺素指数(FT_4I),可代表FT_4相对值。对各种甲状腺功能状态的体外试验的合理选择程序,游离甲状腺素指数设列为首选指标之一。目前,国内血清总T_4测定已有试剂箱供应,而RT_3U的测定国内也有开展,但游离甲状腺素指
In the diagnosis of thyroid diseases, there are about 10 kinds of radioimmunoassay kits used in foreign countries. In order to reflect the status of thyroid function more accurately, free thyroxine (FT 4) has been measured in recent years. However, its operation is complicated, Not suitable for clinical application. In 1970, Clark et al. Proposed that the free thyroxine index (FT_4I) was calculated by multiplying the absorption ratio of (125) I-T_3 resin (RT_3U) by TT_4 to represent the FT_4 relative value. A reasonable selection of thyroid function tests in vitro, free thyroxine index set as one of the preferred indicators. At present, the total serum T_4 determination of the domestic supply of reagents, and RT_3U determination of the domestic also carried out, but the free thyroxine