Sperm cryopreservation allows the preservation of sperm biological function for long periods of time for later use in assisted reproductive techniques (ART). However, the freezing and thawing process causes structural and functional damage to sperm, leading to decreased motility and vitality, a loss of plasma membrane integrity and even DNA damage.

In recent years, various strategies have been studied to protect sperm from cryodamage, including the optimization of freezing processes, the design of freezing devices, and improved freezing media.

One possible measure to mitigate the cryodamage suffered by sperm is the addition of PRP, or platelet-rich plasma, to the freezing medium. In previous studies, PRP components have been shown to have positive effects on semen quality, improving motility, viability, and plasma membrane integrity after cryopreservation. In light of these positive results, this study will evaluate the possibility of incorporating PRP into sperm cryopreservation media and its potential future benefits for patients and clinical outcomes. To this end, each semen sample after a previous spermiogram will be aliquoted, and 0%, 1%, 2%, and 5% PRP will be added to the cryopreservation medium according to the sperm group to which the belong. A spermiogram will be performed after cryopreservation to assess various semen quality parameters, including sperm count, motility, morphology, vitality, and chromatin dispersion. The data must be processed through statistical analysis to obtain results that allow determining, primarily, whether there is a beneficial effect on sperm quality after sperm motility and sperm during cryopreservation with the addition of PRP.

The main objective of this study will be to detect whether there is a significant difference in progressive mobility between the control group and the cryopreserved samples with 5% autologous PRP.

The secondary objectives will be as follows:

Detect significant differences in progressive mobility between the control group and the cryopreserved samples with autologous PRP at concentrations of 1% or 2%; Determine if there are significant differences in the values of the semen quality parameters according to the categorical concentration of PRP used in cryopreservation.; Determine if there is a correlation between the numerical concentration of PRP and the semen quality parameters; Check if the platelet count, that is, the concentration of platelets present in the autologous plasma which has a higher concentration of platelets than the original sample, is correlated with the semen parameters analyzed post-thawing.

Inclusion Criteria:

Age from 18 to 35 years

Concentration higher than 50 million progressively motile sperm.

Morphology: more than 4% normal sperm shapes.

Exclusion Criteria:

Presence of personal or hereditary pathology.

Presence of psychological or behavioral disorder.

Semen parameters below those indicated in the inclusion criteria.

The study population consists of semen donors between 18 and 35 years old who attend the IVI Alicante center during the study period, and who have been verified to meet the inclusion/exclusion criteria.