Semen Samples and Individual Sperm
from Section 3 - Gametes
Published online by Cambridge University Press: 07 August 2023
Cryopreservation of human spermatozoa offers male patients the option to preserve fertility prior to initiating cancer therapy, vasectomy or assisted reproductive technology (ART) treatment. Human sperm can be easily cryopreserved in liquid nitrogen and stored for years. A number of cryopreservation techniques and cryoprotectants have been investigated. To date, however, vapour-phase or programmed slow cooling using a glycerol/egg yolk buffer cryoprotectant has been the most widely applied sperm cryopreservation protocol. Sperm cryosurvival rates of 40% to 60% are generally achievable. However, in patients having low motility or low sperm number at the outset, cryopreservation and recovery of viable sperm can be more challenging. In such cases, freezing of single sperm or small numbers of sperm is emerging as a valuable tool. With this technique, intracytoplasmic sperm injection (ICSI) can be performed even in cases with only a few frozen spermatozoa.
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