# What is Oocyte cryopreservation (egg freezing)?

Source: https://oncologyistanbul.com/glossary/oocyte-cryopreservation

> A fertility-preservation procedure that retrieves and freezes a patient's eggs before cancer treatment begins.

Egg retrieval typically requires 10–14 days of ovarian stimulation before the eggs can be collected and frozen, which is why the tumor board discusses this option as early as possible if treatment urgency allows the delay. It is one of several fertility-preservation options considered for patients of reproductive age before chemotherapy or radiotherapy starts.

## Authoritative references
- [Wikipedia](https://en.wikipedia.org/wiki/Oocyte_cryopreservation)
- [Wikidata](https://www.wikidata.org/wiki/Q3561328)

Full glossary: https://oncologyistanbul.com/glossary