Factors that may influence such fetal cell microchimerism include histocompatibility, fetal or placental abnormalities, or a reproductive history that includes miscarriage or elective termination.

• 可以影响胎儿细胞这种微嵌合状态的因素有很多，包括： 组织相容性、胎儿或胎盘的异常，还有异常的妊娠史如流产和选择性终止妊娠等。