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21 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Air Conduction (Ascending) Gross Search Steps
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1) 1000 Hz @ 30 dB HL 2) If response, begin fine search measurement If no response, present tone at 50 dB HL, if still no response continue to raise in 10 dB HL increments until audiometer runs out.
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Bone Conduction
(Ascending) Gross Search Steps |
Procedures for finding bone conduction thresholds are essentially identical to air conduction thresholds,
with a slight exception (frequencies to be tested). Headphones or insert receivers are removed and the bone oscillator is placed on the mastoid process. (unless masking) 2) 1000 Hz @ 30 dB HL 3) If response, begin fine search measurement If no response, present tone at 50 dB HL, if still no response continue to raise in 10 dB HL increments until audiometer runs out. However, If you have already obtained a pure tone threshold that gives you a hint as to where to start your bone conduction search so you may not start at 30. |
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Air Conduction & BC Fine Search Steps
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Present tone 10 dB below GROSS threshold.
● If patient responds, lower another 10 dB, continue until no response from patient. (Yes=down 10) ● If patient does NOT respond, raise the level 5 dB, continue to do so until patient responds. (No=Up 5) ● When get response, lower 10 dB again and repeat until patient no longer responds. ● Then raise again 5 dB, repeat this series until response is obtained at this frequency for a particular dB level 2 out 3 times. |
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AC Order of Frequency Testing
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Proper Order for Frequency Testing: 1. Initial testing at 1000 Hz 2. Then 2000, 3000, 4000, 6000, 8000 Hz
3. Retest 1000 Hz before testing 4. 500, 250, 125 Hz (if needed) 5. Retesting of 1000 Hz is not necessary for the second ear. When low frequency loss exists, measure at 125 hz. When a diff of 20 db or more between threshold values at any two adjacent octaves also measure inter octaves. |
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Rules for AC Testing Frequency Order
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• When a low-frequency hearing loss exists, i the hearing threshold at 125 Hz should also be measured.
• When a difference of 20 dB or more exists between the threshold values at any two adjacent octave frequencies from 500 to 2000 Hz, inter-octave measurements at 750 Hz and 1500 Hz should be made. |
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Bone conduction testing frequency order
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1. Initial testing at 1000,
2. Then 2000, 4000, 3. retest at 1000 before testing 4. 500 and 250 Hz. 5.Many audiologists do NOT perform the 1000 Hz reliability check or test semi-octaves by bone conduction unless there is reason to do so. However, a 3000 Hz bone conduction threshold is recommended if that frequency was tested by air-conduction. |
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How do you calculate PTA
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PTA (Pure Tone Average) - pure tone average is usually found by averaging 500, 1000, and 2000 Hz for air conduction.
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How do you calculate Air Bone Gap
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AC – BC = ABG
Whole Ear – SensoriNeural Ear = Conductive Hearing Loss |
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Formula to determine if AIR Conduction Masking is Needed
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AC(TE) – IA >= BC (NTE)
Where IA=40if using Supra Aural OR IA = 70 if using Inserts |
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Formula to determine Initial amount
of masking (IM) for AIR Conduction |
IM = AC NTE+ 10 dB EML
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Formula to determine if Bone
Conduction Masking is Needed |
ABG (TE) > 10 dB
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formula to determine Bone Initial amount of masking (IM)
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IM = AC NTE+ 10 dB EML (effective masking level) + the amount needed to overcome the OE (occlusion effect).
OE = In low frequencies, additional masking should be added to the starting levels at low frequencies. 15 dB should be added to 250 Hz and 500 Hz and 10 dB should be added at 1000 Hz. |
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Masked Air Conduction Procedure (Plateau Method) Steps
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1. Determine if Masking is needed using the Air Conduction Masking Needed Formula
2.Select the initial amount of masking IM formula for air using Narrow band noise on the audiometer for the NTE. 3. Reestablish threshold in the TE with this initial amount of masking in the NTE. 4. Each time the patient responds to the PT signal presented to the TE, increase masking noise in the NTE by 10 dB. 5. Each time the patient does not respond to the PT signal in the TE, increase the tone in the test ear by 5 db steps until the patient responds again. 6.This procedure is continued until the masking noise can be increased over a 30 dB interval (3 consecutive 10 dB steps) without producing a shift in the threshold level of the TE. Now you have reached the “Plateau” and the AC pure tone intensity level you reached is the actual threshold of the TE. |
nmemonic=YES, increase beauty with 10 ingriedient facial MASK toNighTE
NO=tone me more add 5 pounds to my Tricep Extension . |
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Masked Bone (Plateau) Procedure & similarity differences from AC
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Similar to AC Masking procedure except Placement of headphones and bone oscillator is very important.
Keep in mind that because the earphone is placed over the NTE, then the occlusion effect, which we talked about earlier, may be created in that ear. The occlusion effect may cause BC thresholds to shift once headphones are placed on the head. 1. Determine if masking is needed using the Bone Conduction Masking Formula 2. Follow same steps as Masked Air beginning with Step 2 using the formula for initial Bone Masking Bone Conduction Masking Needed Formula the formula for Initial Bone Masking |
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Degree of Loss Range
Normal Hearing |
0-15 dB
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Degree of Loss Range
Slight Loss |
16-25 db
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Degree of Loss Range
Mild Hearing Loss |
26-40 db
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Degree of Loss Range
Moderate Loss |
41-55 dB
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Degree of Loss Range
Moderately Severe Loss |
56-70 db
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Degree of Loss Range
Severe Loss |
71-90 dB
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Degree of Loss Range
Profound Loss |
> 90 dB
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