The semen is frozen at the assisted reproduction center or sperm bank where the sample is delivered. For this purpose, the sample is placed in containers (straws or cryotubes) and immersed in liquid nitrogen at -196°C.
Semen samples frozen in liquid nitrogen can be stored for years without any problem. The sperm do not suffer any damage and remain with practically the same characteristics as the moment when they were frozen.
Read the full article on: Using donated sperm: donor requirements, prices and treatments ( 69).
Degree in Human Biology (Biochemistry) from the Pompeu Fabra University (UPF). Official Master's Degree in Clinical Analysis Laboratory from the UPF and Master’s Degree about the Theoretical Basis and Laboratory Procedures in Assisted Reproduction from the University of Valencia (UV).