text: 表15-1GH缺乏症诊断常用药物激发试验2.血清IGF-1及IGFBP3测定血循环中IGF-1大多与IGFBP3结合（95%以上），IGFBP3有运送和调节IGF-1的功能，两者分泌模式与GH不同，IGF-1呈非脉冲性分泌和较少日夜波动，故血中浓度稳定，并与GH水平呈一致关系，是检测下丘脑-GH-IGF生长轴功能的指标。
entities.entity: GH缺乏症
entities.label: dis
entities.entity: 药物激发试验
entities.label: pro
entities.entity: 血清IGF-1及IGFBP3测定
entities.label: pro
entities.entity: 血循环
entities.label: bod
entities.entity: IGF-1
entities.label: bod
entities.entity: IGFBP3
entities.label: bod
entities.entity: IGFBP3
entities.label: bod
entities.entity: IGF-1
entities.label: bod
entities.entity: GH
entities.label: bod
entities.entity: IGF-1
entities.label: ite
entities.entity: 血
entities.label: bod
entities.entity: GH
entities.label: ite
entities.entity: 下丘脑-GH-IGF生长轴
entities.label: bod