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游离甲状腺素(FT_4)浓度经常作为检查甲腺机能的指标之一。临床实验室广泛应用T_4抗体免疫提取技术来测定患者血清FT_4,测定中使用的放射性标记T_4类似物与T_4竞争抗体,却不与血清中的T_4结合
Free thyroxine (FT 4) concentration is often used as an indicator of hypothyroidism. T_4 antibody immunoassay technique is widely used in clinical laboratories to measure serum FT_4 in patients. The radiolabeled T_4 analog used in the assay competes with T_4 antibodies but does not bind to T_4 in serum