Background: Establishing clinic-specific normative data for auditory brainstem response (ABR) tests is important due to variability in stimulus parameters and equipment. Objective: To establish normative values for ABR measurements in infants aged 3 to 6 months. Design: Descriptive study. Participants: 12 normal-hearing male and female infants, aged 3 to 6 months, who underwent ABR tests. Setting: Audiology Unit, Department of Otorhinolaryngology - Head and Neck Surgery, Southern Philippines Medical Center, Davao City, January 2021 to December 2022. Main outcome measures: Absolute latency readings for waves I, III, and V, and interpeak latencies for waves I-III, III-V, and I-V using Interacoustics Eclipse EP15 apparatus with a RadioEar IP30 Insert Earphone transducer at a stimulus intensity of 60-90 dBnHL and a rate of 45.1 clicks/sec. Main results: All normative ABR ranges were computed with a threshold of ± 2 SD from the means. The computed means (normative ranges) for absolute latencies for waves I, III, and V were 1.49 ± 0.15 (1.19-1.78) msec, 4.45 ± 0.32 (3.81-5.10) msec, and 6.65 ± 0.26 (6.12-7.17) msec, respectively. The computed normative values for interpeak latencies for waves I-III, III-V, and I-V were 2.80 ± 0.22 (2.36-3.23) msec, 2.19 ± 0.21 (1.78-2.61) msec, and 4.99 ± 0.29 (4.41-5.57) msec, respectively. Conclusion In our study, we have established normative values for ABR test measurements for infants aged 3 to 6 months.
Hearing Loss ; Audiology