患者，女，24岁。乏力、心悸、怕热、多食3个月，大便3～5次/日，不成形。体重下降约8kg。查体：BP140/66mmHg，皮肤潮，手有细颤，轻微突眼，甲状腺Ⅱ度弥漫性肿大，质软，血管杂音（+），心率118次/分。对诊断最有帮助的检查是（）

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