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The primary function of the ear is to perceive and process human speech. Hearing tests, frequently requested by patients, are fundamentally based on this principle. Speech audiometry's main objective is to assess the status of a stimulus sound within the ear and guide specialists regarding the patient's auditory function. Thresholds established for this test include Speech Reception Threshold (SRT), Speech Discrimination Score (SDS), Most Comfortable Loudness Level (MCL), and Uncomfortable Loudness Level (UCL).
The Speech Reception Threshold (SRT) represents the sound intensity level at which patients can understand 50% of the words presented. Patients are presented with six, three-syllable words at an intensity approximately 10-15 dB above their suspected threshold. Following successful repetition, the intensity is lowered by 5 dB, and another list is presented. If the list is correctly repeated, the intensity is lowered by another 5 dB. If the patient correctly identifies at least two out of six words, the intensity level from the previous step is determined as the SRT.
Speech Discrimination Score (SDS) focuses on the patient's ability to repeat 25 monosyllabic words presented at an intensity 25-40 dB above their SRT. The percentage of correct responses is multiplied by four to obtain the SDS. In patients without hearing complaints, this percentage averages 90%.
The Most Comfortable Loudness Level (MCL) is the listening level between the SRT and the UCL.
The Uncomfortable Loudness Level (UCL) is the sound intensity at which the patient experiences discomfort.
Higher SRT and UCL values are observed in patients with conductive hearing loss. In individuals without hearing complaints, speech audiometry typically yields an SRT of 20 dB, an MCL of 40-60 dB, an SDS of 90-100%, and a UCL of 100-120 dB.
What is Speech Audiometry?
The Speech Reception Threshold (SRT) represents the sound intensity level at which patients can understand 50% of the words presented. Patients are presented with six, three-syllable words at an intensity approximately 10-15 dB above their suspected threshold. Following successful repetition, the intensity is lowered by 5 dB, and another list is presented. If the list is correctly repeated, the intensity is lowered by another 5 dB. If the patient correctly identifies at least two out of six words, the intensity level from the previous step is determined as the SRT.
Speech Discrimination Score (SDS) focuses on the patient's ability to repeat 25 monosyllabic words presented at an intensity 25-40 dB above their SRT. The percentage of correct responses is multiplied by four to obtain the SDS. In patients without hearing complaints, this percentage averages 90%.
The Most Comfortable Loudness Level (MCL) is the listening level between the SRT and the UCL.
The Uncomfortable Loudness Level (UCL) is the sound intensity at which the patient experiences discomfort.
Higher SRT and UCL values are observed in patients with conductive hearing loss. In individuals without hearing complaints, speech audiometry typically yields an SRT of 20 dB, an MCL of 40-60 dB, an SDS of 90-100%, and a UCL of 100-120 dB.