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READING AN AUDIOGRAM AND EXPLAINING IT TO A CHILD OR ADULT – THE INITIAL DESCRIPTION. Paul Peryman, Senior Audiologist, Van Asch Deaf Education Centre, November 2013. Unaided air and bone conduction audiograms typically show hearing thresholds for pure tone stimuli as a function of pure tone frequency. The use of air and bone conducted stimuli is to help determine the type of hearing loss in each ear. The lower down on the dBHL audiogram scale the threshold entry, the greater the degree of hearing loss at any frequency. The audiogram can be read at individual frequencies, or as a whole in terms of: -‐ the overall degree of hearing loss or the pure tone average, and -‐ the shape of the audiogram graph for each ear. Categories of degree of hearing loss are shown on the audiology resource sheet “Audiograms – An Explanation”. The pure tone average is usually calculated from the thresholds for hearing at 500, 1000 and 2000Hz. These frequencies are considered to represent the most important frequencies for understanding speech, and may help in estimating the degree of handicap that a particular hearing loss is likely to cause. The shape of the audiogram graph for each ear is found by reading across the test frequencies (usually at octave intervals) on the audiogram from left to right. The classification of audiometric configuration is as follows: -‐ -‐ -‐ -‐ -‐ -‐ -‐ -‐ Flat ≤ 5dB average difference per octave Gently Sloping 6-‐10dB fall or rise per octave Steeply sloping (Ski slope) 11-‐15dB fall or rise per octave Precipitously sloping ≥ 16dB fall or rise per octave Rising (reverse slope) better hearing in the high frequencies Trough shaped ≥ 20dB more loss in middle frequencies than at 250 or 8000Hz Dome Shaped ≤ 20dB more loss in middle frequencies than at 250 or 8000Hz Notched Sharply poorer at one frequency, with recovery at the adjacent frequencies Examples of audiogram explanation and description can be seen at: -‐ -‐ -‐ -‐ http://www.raisingdeafkids.org/hearingloss/testing/audiogram/corner.php http://www.raisingdeafkids.org/hearingloss/testing/audiogram/ski_slope.php http://www.raisingdeafkids.org/hearingloss/testing/audiogram/slope.php http://www.raisingdeafkids.org/hearingloss/testing/audiogram/ome.php Read, describe and interpret the following audiograms ( [= right ear masked bone conduction, and ]=left ear masked bone conduction; the rest of the symbols are as used in NZ)
