HARI Treatment Options

Slow Cooling:

Around since the 1980's and well established as a successful method for cryopreserving both eggs and embryos, slow cooling is the technique which involves initial dehydration to remove water and to replace it with a cryoprotective fluid. During the computer controlled freezing programme, the eggs or embryos are protected from ice crystal formation. The concentration of the cryoprotectant is quite low and the actual freezing process can take up to around 2 hours as the oocytes / eggs are gradually cooled in a specialised machine to -196°C.