随着围产医学及新生儿医学的进展,早产儿的病死率显著降低,早产低体重儿的存活率明显增加。由于早产儿尚未发育成熟,特别是一过性的下丘脑-垂体-甲状腺系统的异常,引起早产儿出现暂时性低甲状腺素血症(THOP),在早产儿是比较常见的现象[1],包括低T3、T4血症,TSH升高但低于20mU/L With the progress of perinatal medicine and neonatal medicine, the mortality of premature children is significantly reduced, and the survival rate of preterm low birth weight children is obviously increased. Because premature infants have not yet matured, especially the transient hypothalamic-pituitary-thyroid system abnormalities, premature infants caused by temporary hypothyroxinemia (THOP), is more common in preterm infants [1], Including low T3, T4 blood disease, TSH increased but less than 20mU / L