In Tjitske Zaat and colleagues’ study,1 fewer than 3% of patients in natural menstrual cycles were administered exogenous progesterone for luteal phase support. In their Comment,2 Shari Mackens and ...

Freezing eggs vs. embryos Freezing eggs is different from freezing embryos. An embryo is an egg that a lab has successfully fertilized with a sperm. Egg freezing stores unfertilized eggs only.

“You’ve got better chances of a live baby if you freeze an embryo, but then if I meet ‘Mr Right’ ... then I wouldn’t want to use the egg frozen with someone else’s sperm.” ...