Involves cryopreservation (freezing of sperms in males and oocytes in females for future use. Embryos (Fertilized oocytes with Sperm) are preferable wherever possible since they have a much higher survival compared to oocytes.
This is indicated in
1. Patient scheduled for chemo therapy / radio therapy for cancer.
2. Women who are at a critical age ( >35 years ) and want to delay childbearing.