先天性甲状腺功能低下 (简称ＣＨ) ,是由于新生儿血液中甲状腺减少而引起的一种内分泌代谢性疾病。但ＣＨ在新生儿期常缺乏特异症状 ,仅靠临床观察来达到对该病的早期诊断还较为困难 ,常被忽略而延误治疗 ,造成不可逆智能发育障碍。因此 ,必须建立、健全系统有效的早期筛检方案 Congenital hypothyroidism (referred to as CH), is due to neonatal blood thyroid reduction caused by an endocrine and metabolic diseases. However, CH often lack of specific symptoms in neonatal period, clinical observation alone to achieve the early diagnosis of the disease is still more difficult, often overlooked and delayed treatment, resulting in irreversible mental retardation. Therefore, we must establish and perfect a systematic and effective early screening program