三、新生儿出血症新生儿出血症（hemorrhagicdiseaseofthenewborn，HDN）为维生素K依赖的凝血因子Ⅱ、Ⅶ、Ⅸ、Ⅹ减少而引起的出血，又称新生儿自然出血症、维生素K依赖性出血症、新生儿低凝血酶原血症。
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