（二）地方性甲状腺肿的诊断标准居住在地方性低碘甲状腺肿病的流行区，有甲状腺肿大的临床表现及相关的压迫症状，排除甲状腺肿大的其他甲状腺疾病，实验室检查表现为尿碘偏低，血浆中TSH可有不同程度增高，血浆中T<sub>4、</sub>T<sub>3</sub>浓度多属于正常，但严重患者T<sub>4</sub>身体低于正常，T<sub>3</sub>稍高，甲状腺扫描也可见弥漫型或结节性甲状腺肿大。
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