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在所有妊娠中,妊娠早期出血发生率达25％,大约50％的病例导致继发流产。随着超声检查分辨力的提高和应用的增加,已观察到越来越多的病例胎儿存活合并宫内血肿(IUH),发生率约20％。
In all pregnancies, bleeding occurs in up to 25% of pregnancies and about 50% of cases result in secondary miscarriage. With increasing resolution and increasing use of ultrasound, more and more cases of fetal survival combined with intrauterine hematoma (IUH) have been observed with an incidence of about 20%.