Abstract
Objective: Past studies have suggested that controlled-rate freezing (CRF) of semen may improve sperm cryosurvival rates, especially for cases of male-factor infertility. However, CRF has the disadvantage of being more expensive due to additional costs for the freezer, liquid nitrogen vapor used during controlled freezing and more technician labor. The objective of this study was to compare a newly developed method of noncontrolled-rate freezing (NCRF) to our established CRF method.
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