晚发性维生素Ｋ缺乏症又称婴儿特发性维生素Ｋ缺乏症 ,或婴儿获得性维生素Ｋ依赖因子缺乏症。现将本院 1 992～ 1 997年收治的 75例报道如下。1　临床资料1 1　一般资料　发病年龄 :最小 1 4ｄ ,最大 4个月 ,其中 1 4～ 6 0ｄ者 72例 ,占 96 %。四季均可发病 ,夏秋两季共 46 Late-onset vitamin K deficiency, also known as infant idiopathic vitamin K deficiency, or infant acquired vitamin K-dependent deficiency. Now hospital from 1992 to 1997, 75 cases were reported as follows. 1 Clinical data 1 1 General information Age of onset: the smallest 14d, maximum 4 months, of which 14 ~ 60d 72 cases, accounting for 96%. Four seasons can be disease, a total of 46 in summer and autumn