30.very low birth weight infant(VLBW) means: A.weight within 1 hour after birth <1.5kgB.weight within 1 hour after birth <kgC.weight within 1 hour after birth <2.5kgD.weight within 1 hour after birth <1kg A: A.weight within 1 hour after birth <1.5kg B: B.weight within 1 hour after birth <kg C: C.weight within 1 hour after birth <2.5kg D: D.weight within 1 hour after birth <1kg

关于先天性甲状腺机能减退症新生儿筛查不正确的是: 低出生体重儿（LBW）和极低出生体重（VLBW）儿生后24小时筛查|危重新生儿或接受过输血治疗的新生儿可能出现筛查假阴性结果|对甲低筛查阴性病例，有可疑症状，应采血再次检查甲状腺功能|新生儿筛查可以发现原发性甲低和高TSH血症，但无法检出中枢性甲低、TSH延迟升高的患儿|足月新生儿出生7天之后，并充分哺乳，足跟采血，滴于专用滤纸片上测定干血滤纸片TSH值进行筛查