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放射性碘测定甲状腺机能状态的方法有三种:即甲状腺吸碘测定,尿排碘测定及血液中放射性碘的测定。一般皆用甲状腺吸碘及尿中排碘测定,但还不能真实地反映出血液中甲状腺激素碘的水平。血浆内碘以两种形式存在,一种是无机碘,一种是蛋白结合碘。无机碘能穿透红细胞膜进入红细胞内,蛋白结合碘不能穿透红细胞膜而存留在血浆中,在服碘以后24小时红细胞碘与血浆碘就达到了平衡。甲状腺机能正常时,红细胞碘与血浆碘有一定的比率。甲状腺机能亢进时,血液中无机碘减少,蛋白结合碘增加,比率值下降。因此,根据红细胞碘与血浆碘的比率就可以测定甲状腺机能状态。根据此原理,我们共测
Radioactive iodine determination of thyroid function in three ways: the thyroid iodine determination, urine iodine determination and determination of radioactive iodine in the blood. Generally use thyroid iodine and urine iodine determination, but still can not truly reflect the level of thyroid hormone iodine in the blood. Plasma iodine exists in two forms, one is inorganic iodine, one is protein-bound iodine. Inorganic iodine can penetrate the erythrocyte membrane into the red blood cells, protein bound iodine can not penetrate the red blood cell membrane and remain in the plasma, 24 hours after serving iodine red blood cells iodine and plasma iodine reached a balance. Normal thyroid function, red blood cells iodine and plasma iodine have a certain ratio. Hyperthyroidism, the reduction of inorganic iodine in the blood, protein-bound iodine increased, the ratio decreased. Therefore, thyroid function status can be determined based on the ratio of erythrocyte iodine to plasma iodine. According to this principle, we test together