In vitro fertilization: how embryos are created
IVF combines eggs and sperm in the lab to create embryos. Their development is then observed, and decisions are made about which can be transferred or frozen. Obtaining eggs, fertilizing, and achieving a birth are different stages.
In vitro fertilization: how embryos are created
- What happens in the lab
- Why the numbers change
- What decision comes next
- Related articles
- Sources
In vitro fertilization, or IVF, is the technique used to create embryos for gestational surrogacy.
What happens in the lab
Eggs are combined with sperm through conventional IVF or ICSI. The resulting embryos are kept under controlled conditions to observe their development.
Why the numbers change
Not all obtained eggs will be usable, nor will all fertilize. Not all embryos will reach the stage intended for transfer or freezing. Therefore, the initial number does not equal the number of embryos available at the end.
What decision comes next
The laboratory and medical team review which embryos can be used. They may recommend freezing and, if indicated, discuss genetic testing. The plan should explain the purpose of each procedure.
You can request a report that distinguishes received eggs, mature eggs, fertilizations, and preserved embryos. The team can explain this sequence and address any questions you may have.
