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甲状腺T3T4
T3血清总三碘甲腺原氨酸,这是判断甲状腺功能亢进或甲状腺功能低下症常用的指标,诊断为甲状腺功能亢进症的具体指标,同时对病情严重程度评估,治疗监测中的应用。成人:1.8~2.9nmol/升(0.12~0.19ug/迪)。
T4甲状腺素血清总甲状腺素,是人体主要的甲状腺,随着年龄的增长,血清浓度逐渐降低。这是判断甲状腺功能亢进(俗称"甲亢")或甲状腺功能低下症(俗称"甲减")的常用指标,同时对病情严重程度评估,一般治疗监测中的应用。
T3T4上升是一种主要指标判断甲状腺功能亢进症,但不是唯一的,因为怀孕、口服避孕药,能使上升。雄激素、低蛋白在皮质激素的作用下可导致甲状腺T3T4下降。因此,简单的T3T4上升是无法确诊有甲状腺功能亢进症,你仍然需要进一步检查,如比如TSAbTSH。
T3、T4在妊娠、服避药、雌激素治疗等情况下可增高;在雄激素和强的松治疗、肾病综合征、肝功衰竭、服用苯妥英钠和保泰松时可减低,故对甲亢诊断准确性受到限制。但FT3、FT4不受上述因素影响,是目前诊断甲亢、甲减的常用化验指标。
但是多数医院常将TT3、TT4、FT3、FT4一起检查。FT3占总T3的0.3%,FT4占总T4的0.04%,含量虽然少,但生物活性极高,因为只有游离T3、T4才能进入细胞内,起到生理作用。

扩展资料:
只有T3增高:T3型甲亢:在碘缺乏地区。甲状腺功能亢进:甲状腺功能亢进症等的药物治疗后,甲状腺素是正常的,而T3持续不降甚至增加,T3(毫微克/毫升)、甲状腺素(微克/毫升)>30,这种类型的复发率高,适当的手术治疗。
甲状腺功能亢进症,甲状腺功能亢进症复发的早期或初始阶段。正常甲状腺组织是根据性能:t49比分泌,和甲状腺片11、T4号12,内容大约是平等的,并吸收效率为95%,甲状腺素40%,长期使用会出现这一现象的增加。所以现在提倡使用左旋甲状腺素钠(优甲乐),可以避免缺乏甲状腺素。
只有T4增高:和吃含碘食物过多有关,假性T4甲状腺功能亢进症:常见的心肌梗死、心肺疾病、急性脑血管疾病、哮喘、癌症、急性肝疾病,一般随着原发疾病的的治愈而好转。一些老年人甲状腺功能亢进症,但只有甲状腺素高。甲状腺素降低会导致甲状腺功能低下症、慢性心、肺、肝、脑等疾病。
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