en 30009146 <p>Background: Testicular biopsies and ejaculated spermatozoa are routinely cryo-preserved in many units but the fate of these samples has not provoked large interest. This prompted us to review our data accumulated during a period of 20 years (1997 to 2016).<br /> Methods: For patients with biopsies (group 1) or ejaculated spermatozoa (group 2), an attempt was made to evaluate whether the samples&nbsp; stored, had been discarded with the patient&rsquo;s consent or because the patient had died, or whether they had been transported to another laboratory. In each of these categories, a previous use in our program of assisted reproduction was assessed.<br /> Results: The total utilization rate in group 1 (n=95) was 53.7% and only 5.48% in group 2 (n=365). In both groups, deceased patients had not previously used their cryopreserved samples. In detail, the utilization rates for still banked, discarded and transferred samples were 84.2%, 50% and 27.3%, respectively in group 1 and 2.88%, 10.4% and 10%, respectively in group 2.<br /> Conclusion: The exact reasons for the low utilization rates of cryopreserved male gametes remain to be explored. A closer contact between sperm banking units and patients might be useful to discuss the need for further storage of the probes, their possible disposal or the prospects when a specific use for assisted reproduction is intended.</p> Assisted reproduction, Cryopreservation, Male fertility preservation, Spermatozoa, Testicular biopsy 115 119 https://www.jri.ir/article/10013 https://www.jri.ir/documents/fullpaper/en/10013.pdf BerndRosenbuschDepartment of Gynaecology and Obstetrics, Ulm University, Ulm, Germanybernd.rosenbusch@uniklinik-ulm.de11789