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Answer questions 1-6 separately for the following two sets of thresholds. Assume that all thresholds are unmasked and measured using TDH-49 headphones. SET A 250 Hz 45 AC Right AC Left 15 5 BC Forehead 500 Hz 50 1000 Hz 55 2000 Hz 55 4000 Hz 60 8000 Hz 65 10 5 10 0 10 10 5 5 10 250 Hz 50 500 Hz 55 1000 Hz 65 2000 Hz 70 4000 Hz 70 8000 Hz 75 35 45 55 55 60 70 20 25 30 35 40 35 40 45 45 50 SET B AC Right AC Left BC Right Mastoid BC Left Mastoid 1. What is the type of hearing in the left ear? a. Normal b. Conductive c. Mixed d. Sensorineural 2. What is the degree of hearing loss in the left ear based on the three-frequency PTA? a. Slight b. Moderate c. Moderately-Severe d. None of the above/Not applicable 3. What is the type of hearing in the right ear? a. Normal b. Conductive c. Mixed d. Sensorineural 4. What is the degree of hearing loss in the right ear based on the three-frequency PTA? a. Mild b. Moderate c. Moderately-Severe d. Profound 5. Which of the following BC thresholds will have to be rechecked with masking because cross-hearing is suspected? a. Left ear b. Right ear c. Both d. Neither 6. Based on these unmasked thresholds, which of the following AC thresholds will have to be rechecked with masking because cross-hearing is suspected? a. Left ear b. Right ear c. Both d. Neither 7. For SET A, If you do suspect cross-hearing, which ear do you think is ‘helping’ the other? ** a. Right helping the left b. Left helping the right 8. When measuring masked right ear thresholds, the test and non-test ears are the __________ ear and __________ ear, respectively. a. Right, Left b. Left, Right 9. Which of the following arrangements would be appropriate when measuring masked right ear thresholds? a. Tone in the right ear, noise in the left b. Tone in the left ear, noise in the right c. Tone in both ears d. Noise in both ears ANSWERS Question SET A SET B 1 a d 2 d (Since hearing is normal) B (The 3-frequency PTA is 51.67 dB) 3 b c 4 b (The 3-frequency PTA is 53.3 dB) c (The 3-frequency PTA is 63.3 dB) 5 b (Since ABG > 10) b 6 b (Using the formula ACTE – 40 ≥ BCNTE) d 7. b (The left ear is the better ear. Therefore, it is probably participating in the responses of the right ear) 8. a 9. a