Impact of Testosterone Therapy on Voices in Trans-Masculine People: A Scoping Review

Treatment of trans people by speech-language pathologists (SLPs) dates back to at least the 1980s. However, the majority of early research on the voices of trans people focused on trans-women. More recently, the field of speech-language pathology has garnered more interest in the effects of testosterone therapy in trans-masculine individuals. The goal of this project is to review current research, and compile the known effects of testosterone therapy in the trans-masculine population on common acoustic indices of voice production, including fundamental frequency (pitch), decibels/sound pressure level (dB SPL; loudness) and cepstral peak prominence (voice quality). A scoping literature search was conducted from January 2024 to March 2024 via PubMed as well as from manual and ancestral searches. No limitations were placed on publication dates. Articles were screened to include only those specifically related to the above-referenced purpose and exclude pediatric articles or those related to cis-gender voices, or trans-feminine voices. The results of the literature review will be presented and discussed