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Sperm freezing (sperm storage)

Sperm can be frozen by mixing the sample with a media containing cryoprotectants
to allow the sperm to survive at very low temperatures. Samples are frozen in clearly
labelled plastic straws and stored in liquid nitrogen (-196°C).


Sperm is stored for a number of reasons, including:

  • Preservation of fertility prior to medical treatment (eg. chemotherapy)
  • Absence of the male partner during fertility treatment
  • Potential difficulties in producing a sample on the day of fertility treatment