晚发维生素 K 缺乏症是指新生儿晚期(出生两周后)到乳儿期因缺乏维生素 K 而引起的出血性疾病。尤以颅内出血多见。本症在临床上并不少见,发病急、病情重,易被误诊而贻误治疗时机,病死率和病残率高,已引起高度重视。我院1986年6月～1989年6月收治12例,现报告如下。 Late onset vitamin K deficiency refers to the late neonatal (two weeks after birth) to infancy due to a lack of vitamin K bleeding disorders. Especially intracranial hemorrhage more common. This disease is not uncommon in clinical, acute onset, severe illness, easily misdiagnosed and delayed the timing of treatment, mortality and morbidity, has attracted great attention. Our hospital from June 1986 to June 1989 were treated in 12 cases, the report is as follows.