Complete abortion: all products of conception have been passed without the need for surgical or medical intervention

Incomplete abortion: some, but not all, of the products of conception have been passed; retained products may be part of the fetus, placenta, or membranes

Inevitable abortion: the cervix has dilated, but the products of conception have not been expelled

Missed abortion: a pregnancy in which there is a fetal demise (usually for a number of weeks) but no uterine activity to expel the products of conception

Recurrent spontaneous abortion: three or more consecutive pregnancy losses

Septic abortion: a spontaneous abortion that is complicated by intrauterine infection

Threatened abortion: a pregnancy complicated by bleeding before 20 weeks’ gestation