Blastocysts have begun to form the cells that become the baby and the placenta. Growing embryos to this stage helps selection, but not all embryos reach it.
Fertility Glossary
Blastocyst
An embryo at day five or six with a fluid-filled cavity.
Fertility Glossary
An embryo at day five or six with a fluid-filled cavity.
Blastocysts have begun to form the cells that become the baby and the placenta. Growing embryos to this stage helps selection, but not all embryos reach it.