Basic Audiogram

• Pure-Tone Audiometry: utilizes pure tones (single-frequency sound) at 250, 500, 1000, 2000, 4000, and 8000 Hz at selected intensities; complete series consists of air and bone conduction thresholds (bone conduction thresholds are not measured at 8000 Hz)

• Air Conduction Threshold: lowest level dB HL (hearing thresholds) at which the subject perceives 50% of pure tones introduced via earphones or speakers (sound field), represents conduction from the auricle to the cochlea

• Bone Conduction Threshold: lowest level dB HL (hearing thresholds) at which the subject perceives 50% of pure tones introduced via a bone oscillator apparatus, represents conduction from the bones of the skull to the inner ear (bypassing the TM and ossicles)

• Pure Tone Average (PTA): average thresholds for the speech frequencies (500, 1000, and 2000 Hz); typically should be within 10 dB of the speech reception threshold

• Air-Bone Gap (ABG): decibel difference between bone and air conduction thresholds

• Speech Audiometry: utilizes spoken voice as a sound stimulus at selected intensities

• Speech Reception Threshold (SRT): lowest dB HL patient can repeat a spondee (2-syllable words with balanced accents) 50% of the time

• Speech Discrimination Score (SDS): percentage of phonetically balanced monosyllabic words (phonemes) repeated correctly after being presented at 20-40 dB SL above the SRT

Was this article helpful?

0 0

Post a comment