An audiogram is a document that we use in practice to record a hearing test. In other words, it is the hearing test graph that represents the ability of hearing and which can describe as a picture. It is used to determine if a person is having hearing loss and if so then how bad that loss is.
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A hearing healthcare professional compares some test that can help to decide the hearing loss of a patient. The result of the hearing test is often displayed in the form of an audiogram.
How to read an audiogram?
If we see the audiogram we will notice that there are many colors and symbols on the graph. Each of these marks is important. Every audiogram has a key on the page that helps to understand it.
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If the test is in a sound field, then it’s responses are written on the audiogram as S or NB
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And responses for air conduction hearing as AC and bone conduction hearing as BC, are shown on the graph
Air conduction test the outer, middle and neural parts of the ear. Bone conduction tests only the inner neural parts of the ear.
What will an audiogram look like one ear better than the other?
If in the audiogram there is a shadow curve of parallel lines, also called a mirror audiogram then it means that better ear was not tested and the crossover from the poorer ear being tested. Basically, it means that one ear is tested twice instead of the other ear.
- One line on the audiogram is parallel to the other line as it “shadows” a copy of the first line. That’s why it called a shadow curve. The poorer ear will be further down on the audiogram and better ear will be closer to the top or audiometric Zero dB HL line.
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An uneven loss in both ears. When a person has single-sided deafness or 40+dB difference in hearing between right and left ear. And during the hearing test if the specialist forgets to mask the better ear to keep it from responding to the poorer ear being tested. Then the better ear was mistakenly tested twice.
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For poor tone testing, it takes 40 dB to cross over to the other ear using TDH- 39 headphones, but it’s different at each frequency.
Masking Dilemma
Masking dilemma occurs when there is a conductive type hearing loss in both ears, which is moderate to severe. The dilemma is that an adequate force to mask the non-test ear crosses over the testing ear and invalidates the doorsteps.
Adequate masking is too much. There are several “workarounds” to this masking. When one is masking air conduction if one can use insert earphones.
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