title: A simplified liquid nitrogen vapour method for the cryopreservation of human semen.
abstract: A simple manually operated liquid nitrogen vapour freezing apparatus has been developed for the cryopreservation of human semen. A test method using this apparatus was evaluated by comparison with a conventional freezing method using an ultra cold (-70 degrees C) freezer. Twenty different unselected fresh semen samples were analysed, diluted with cryoprotective medium and then divided into equal numbers of straws prior to freezing by the two methods. A comparison of the average sperm motility before freezing and after thawing using these two methods demonstrated a statistically significant superiority of the simplified test method.
mesh_terms: D005615:Freezing; D006801:Humans; D008297:Male; D009584:Nitrogen; D012662:Semen Preservation / Q000379:methods*; D013081:Sperm Motility
chemical_list: D009584:Nitrogen