First-trimester volumetry includes measurement of the volume of the placenta (PV), embryo (EV), fetus (FV), gestational sac and yolk sac. PV, EV/FV ratio and gestational sac volume are correlated ...

One of the common causes of a miscarriage is an anembryonic pregnancy, or blighted ovum in which the gestational sac ... of approximately 50 percent of first trimester miscarriages, according ...