RESUMEN
BACKGROUND: Fertility preservation (FP) is an important aspect of the care of transgender patients in whom Gender Affirming Medical Treatment (GAT) may begin before puberty is completed. While there are overall few studies that can be used to guide conversations about long-term effects of GAT, there are concerns that GAT could negatively impact fertility. Prior studies have shown low utilization of FP in this population, with avoidance of delay in starting GAT cited as one of the most common reasons for foregoing FP. It is possible that strategies to mitigate delay in commencement of GAT can facilitate higher FP utilization, maintaining options for future family building. OBJECTIVE: To describe our institution's experience with Testicular Sperm Extraction (TESE) for FP and Histrelin Acetate (Supprelin) Subcutaneous Implantation for GAT commencement. STUDY DESIGN: A retrospective review of transfeminine adolescents at our institution from 2010 to 2022 who underwent TESE for FP at the time of Supprelin placement for GAT (FP/SP). Outcomes of interest included successful sperm retrieval, age at first visit to our institution's Transgender Multispecialty Service Health clinic (GeMS), age at time of FP/SP, testicular volume, and Tanner stage at time of FP/SP, and age when GnRH agonist (GnRHa) therapy was prescribed. Testosterone, LH, FSH, and Inhibin B values prior to combination FP/SP were also obtained. RESULTS: Ten patients from 2017 to 2022 underwent FP/SP after prescription of GnRHa based on Endocrine Society Guidelines. Successful sperm retrieval and storage was achieved in all patients. Median age at FP/SP was fourteen years 5.5 months (range 12y5m-16y8m). Median time from GnRHa prescription to FP/SP was two months (range 2-5 m). Mean testicular volume at time of FP/SP was 13.2 cc (SD 3.38 cc, range 8-17 cc), and median Tanner Stage was IV (range III-V). Average testosterone level was 301.60 (SD 173.04), LH 3.00 (SD 1.25), FSH 3.33 (SD 1.71), Inhibin B 208.50 (SD 87.44). CONCLUSIONS: Performing TESE for FP is feasible for transgender youth undergoing Histrelin implant placement, leading to short delays in starting GAT. Testicular volume and endocrine markers can provide preoperative insight into likelihood of successful sperm retrieval during TESE, are needed to identify which patients will have successful sperm retrieval to ensure optimal counseling and informed decision making for providers, patients and families.