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Pure Tone Audiometry Training Course ——Marketing Dept AD-3A Audiometer（Frontage） AD-3A Audiometer（Side View） Air-Conduction Earphone Bone-Conduction Earphone Responsor 1.Look before you touch The clinician should assess whether there are any apparent structural abnormalities and asymmetries of the head in general and the ears in particular, and perform an otoscopic inspection prior to testing. For example, is there evidence of active ear disease, eardrum perforations, atresia, exostoses, external ear abnormalities, or impacted cerumen? Air-Conduction Test 2. Talk before You Test A case history should be taken at this point. If a case history form was completed in advance, then this is the time to review it with the patient for clarification of pertinent details. Always ask if there have been any changes since the last time he was seen. This is also the time when the clinician observes the patient to develop a clinical picture of his auditory status, communicative strategies, and related behaviors. 3. Test Instructions The patient must know exactly what to do during the test. The idea of this test is to find out the softest sounds you can hear. Youre going to hear tones from these earphones. There will be many tones, one at a time. Some of the tones will be loud, but most of them will be very faint, and many of them will be too soft to hear. Your job is to press the responser every time you hear a tone, no matter how faint it is, and not to press the responser whenever you dont hear any tones. We will test one ear and then the other one. Remember, press the responser every time you hear a tone, no matter how faint it is. Do you have any questions? 4. Orientation of the Patient The patient should be seated in a reasonably comfortable chair. Audiologists prefer to have the patient seated with her back to the clinician so that she will not receive inadvertentclues about when test signals are being presented. Patients and doctors is 90 °angle. 5. Earphone Pla