Spontaneous miscarriage is characterized by the expulsion of a blood clot followed by the expulsion of the gestational sac.
A spontaneous abortion is usually characterized by abdominal pain accompanied by vaginal bleeding, which increases as the abdominal pain worsens and blood clots are expelled first, followed by the expulsion of the gestational sac. The gestational sac looks like a white, cottony ball, similar to the lining of the uterus.
The gestational sac expelled in spontaneous abortions is often incomplete, with chorionic tissue inside the gestational sac, which floats on the surface of saline after rinsing with saline.
And the endometrium in the role of HCG can form metaplasia-like changes, these tissues are similar to the chorionic tissue, rinsed by saline after sinking to the bottom of the saline, can not be floated. The discharge can be initially determined by this, if you see the chorionic tissue can be confirmed as a gestational sac.