小儿甲状腺功能减低症(简称小儿甲低)一般可分为先天性甲低和获得性甲低两类。先天性甲低发病年龄较早,起始于胎儿或新生儿期,但其临床症状于生后数周或数月逐渐出现,以严重影响大脑和体格生长发育导致不可逆的智力低下和矮小为主要特征。本病在临床症状出现之前血清甲状腺激素已有改变,用放射免疫法测定新生儿生后30分钟以内的脐血和/或取新生儿生后4～7天的足跟血测T_4和或TSH进行甲低筛选便可作出早期诊断。在临床症状发生之 Pediatric hypothyroidism (referred to as pediatric hypothyroidism) can generally be divided into congenital hypothyroidism and acquired hypothyroidism two categories. Congenital hypothyroidism earlier, beginning in the fetus or neonatal period, but the clinical symptoms in the weeks or months after birth gradually appear to seriously affect the brain and physical growth and development lead to irreversible mental retardation and shortness as the main feature. Serum thyroid hormone has been changed before the onset of clinical symptoms. Radioimmunoassay was used to measure umbilical cord blood within 30 minutes after birth and / or heel blood for 4 to 7 days after neonatal birth. T_4 and / or TSH A low screening can make early diagnosis. Occurs in clinical symptoms