Screening audiometry, Threshold audiometry, Screening audiometry -21 threshold audiometry -21 – Welch Allyn TM 262 Auto Tymp - User Manual User Manual
Page 55: Operation
Revised 4/11/08
3-21
Operation
Screening audiometry
1.
Carefully position the earphones over the individual’s ears so that the red phone covers
the right ear and the blue phone covers the left ear.
2.
Be sure that nothing is obstructing each earphone such as earrings, eye glasses or a hearing
aid.
3.
Instruct the person being tested to raise a hand or a finger (or press the optional
Handswitch) whenever a tone is heard.
4.
Encourage the patient to respond even if he/she is not sure whether a tone is heard.
5.
Select the ear to be tested with the R (right) or L (left) button.
6.
Select the desired screening intensity by rotating the dB HL knob to the appropriate
position. The American Speech Language and Hearing Association recommends 20 dB as
the screening level for school-age children.
7.
Select the desired frequency at which to start the test by pressing the < or > Hz
pushbuttons.
8.
Present the selected intensity via the Present bar.
9.
If the individual fails to respond, increase the intensity by 10 dB and try again. Press the
M+ pushbutton at the intensity level where the individual responded.
10. Continue the procedure for all the desired frequencies.
11. These results can be printed in an audiogram or tabular format. Check the Program mode
to determine which setting has been selected.
Threshold audiometry
1.
As described earlier, carefully position the earphones and select the ear to be tested first.
2.
Familiarize the individual with the test protocol by presenting a tone of 40 dB HL at 1000
Hz.
3.
Decrease the intensity in 10 dB steps until the person no longer responds or until you reach
0 dB HL.
4.
When you believe the individual understands the procedure, (i.e., raise your hand/finger
when you hear a tone) proceed with the test protocol. The level of the first presentation
generally is 10 dB below the level at which the individual responded during the
familiarization procedure.
5.
Starting at the desired test frequency, present the tone for a period of one or two seconds.