Background and Objectives: Speech-in-noise testing is essential for evaluating functional hearing abilities in clinical practice. Although the Quick Speech-in-Noise test (QuickSIN) is widely used, no equivalent tool existed for European Portuguese. This study aimed to develop a Speech-in-Noise Test for European Portuguese (SiN-EP), linguistically adapted and calibrated for native speakers, to support clinical assessment of speech perception in realistic listening environments. Materials and Methods: The SiN-EP was developed through a multi-stage process. Sentences were drafted to reflect natural speech patterns and reviewed by native speakers for clarity and grammatical accuracy. Selected sentences were recorded by a female native speaker in a controlled acoustic environment and mixed with multi-talker babble at signal-to-noise ratios (SNR (dB)) from 25 to 0 SNR (dB). A pre-test in a free-field setting at 65 dB SPL was conducted with fifteen normal-hearing young adults. Participants repeated each sentence, and their responses were analyzed to refine list composition, adjust difficulty, and ensure phonetic balance. Results: Intelligibility decreased systematically as SNR (dB) worsened, with ceiling effects at 25 and 20 SNR (dB). At 5 SNR (dB), high variability was observed, with set 5 showing disproportionate difficulty and set 14 containing an incomplete sentence; both were removed. At 0 SNR (dB), all sets demonstrated expected low intelligibility. The final test comprises thirteen lists of six sentences, each maintaining stable intelligibility, phonetic representativeness, and consistent difficulty across SNRs (dB). Conclusions: The SiN-EP provides a linguistically appropriate, phonetically balanced, and SNR (dB) calibrated instrument for assessing speech-in-noise perception in European Portuguese. The refinement process improved reliability and list equivalence, supporting the test’s clinical and research applicability. The SiN-EP fills a critical gap in assessing speech-in-noise perception in European Portuguese speakers, providing a reliable tool for both clinical and research applications.

Background and Objectives: The Quick Speech-in-Noise test is a widely used clinical tool for assessing an individual’s ability to understand speech in the presence of background noise. Building on this framework, the present study aimed to develop a Speech-in-Noise Test for European Portuguese (SiN-EP), specifically adapted for native speakers of European Portuguese. The goal was to create a reliable and linguistically appropriate tool to evaluate speech perception under realistic listening conditions. Materials and Methods: The development of the SiN-EP involved several stages. Sentences were drafted to reflect natural speech patterns and reviewed by native speakers for clarity and grammatical correctness. Selected sentences were recorded by a female native speaker in a controlled environment. The recordings were then combined with multi-talker babble noise at varying levels to simulate different listening situations, ranging from easy to challenging. A pre-test was conducted in a free field setting at 65 dB SPL with fifteen young adults with normal hearing. Participants listened to and repeated each sentence, and their responses were used to refine the test materials. Results: Participants understood the sentences clearly and consistently across all listening conditions, showing that the SiN-EP effectively reflects speech perception in noise. The final version included thirteen lists of six sentences, carefully designed to maintain natural phonetic balance and realistic speech structure. Conclusion: The SiN-EP represents a significant advancement in evaluating speech understanding in noise for Portuguese-speaking populations. This standardized and linguistically adapted test provides valuable information about auditory performance and supports both clinical assessments and research on hearing and auditory processing challenges.