患者，女，23岁。因停经4＋月，阴道流血1天入院。末次月经1997年2月22日，早孕支应不重，持续月余自行缓解，未感胎动，入院前1天，少量暗红色阴道流血，无齿龈及皮肤粘膜出血，无腹痛，B超指示胎死宫内。22岁结婚，孕1产0。平素月经规律。爱人健康，否认遗传病史。查体：体温 Patient, female, 23 years old. Due to menopause 4 + month, vaginal bleeding one day admission. The last menstrual period February 22, 1997, early pregnancy should not be heavy, more than a month to ease their own self, did not feel fetal movement, 1 day before admission, a small amount of dark red vaginal bleeding, no gums and skin mucosal bleeding, no abdominal pain, B- Palace. 22-year-old married, pregnant and a 0. Regular menstruation. Loving health, denying a genetic history. Physical examination: body temperature