CAOHC Audiometric Monitoring Latest Update 2024-2025 Questions and 100% Verified Correct Answers Guaranteed A+ At First Attempt
6 Specifics of the Baseline Audiogram - CORRECT ANSWER: Initial audiogram.
Reference for later audiograms to track hearing.OSHA allows up to 6 months to get baseline (1 yr if mobile service).Measure before shift; or after 14 hour quiet period.Can use HPDs in lieu of 14 hour quiet period (OSHA).Employer's responsibility of telling workers to avoid non-occupational noise for 14 hours prior to baseline.
15 dB TWICE method (current NIOSH version) - CORRECT ANSWER: In either ear, a
change of 15 dB or more at any frequency from 500-6000 Hz on an annual audiogram and again on retest within 30 days. Shift is seen twice, same frequency, same ear.
According to OSHA, what qualifies a technician to monitor hearing? - CORRECT
ANSWER: Tech reports to audiologist, ORL MD, or physician.
Tech may be certified as "OHC" by CAOHC or has "demonstrated competence" in calibrating audiometer, obtaining valid audiograms, performing audiometric exams.
Definition of asymmetric or unilateral loss - CORRECT ANSWER: Difference of 40 dB or more between ears at any frequency; Difference in average HL between ears of more than 15 dB at 500, 1000 and 2000 Hz or more than 30 dB at 3000, 4000, and 6000 Hz
Definition of significant hearing loss - CORRECT ANSWER: Average HL >25 dB at 500, 1000, and 2000 Hz; Average HL > 25 dB at 500, 1000, 2000, and 3000 Hz; Average HL greater than or equal to 25 dB at 2000, 3000, and 4000 Hz
Details of a daily calibration - CORRECT ANSWER: Daily biologic check on listener or using bioacoustic simulator to verify audiometer output is within at least 10 dB of its specified level. Listening check. Visual check. Document and keep records at least 5 years.
Details of annual acoustic calibration - CORRECT ANSWER: Linearity check and sound pressure output check (need audiometer calibration system - SLM, OB filter, NBS 9A coupler). Keep records at least 5 years.
Details of exhaustive calibration - CORRECT ANSWER: Resets output of audiometers to meet ANSI standards. Every two years. Keep records at least 5 years.
Elements & Considerations of the Hearing Test (6) - CORRECT ANSWER: Case
history. 1 / 2
Otoscopy.Instructions.Tone presentation: present 1-2 seconds, pause longer than the tones last, vary timing.Infection control (sanitizing wipes, headphone covers, gloves, etc.).Documentation.
How are the audiograms used? - CORRECT ANSWER: Compare final (most recent)
audiogram with supra-aural phones to baseline audiogram
How are the comparisons of the audiograms used? - CORRECT ANSWER: To see if a
standard threshold shift (STS) exists.If the baseline needs to be revised.
If the annual audiogram suggests an STS, what happens? - CORRECT ANSWER:
Reschedule a retest within 30 days to determine if STS persists.An immediate retest is recommended.
OSHA definition of Standard Threshold Shift (STS) - CORRECT ANSWER: In either
ear, a change (relative to baseline) of 10 dB or more in the average of AC thresholds at 2000, 3000, & 4000 Hz
Reasons for an "inability to obtain an audiogram" - CORRECT ANSWER: False responses, inconsistent response, test-retest variability at 1000 Hz of 10 dB or more
What are 3 purposes of an audiometric testing program? - CORRECT ANSWER: To
monitor hearing To identify TTS before it becomes PTS To identify progressive NIHL before it becomes handicapping
What are 4 characteristics of annual audiograms for monitoring? - CORRECT
ANSWER: Test air-conduction thresholds only.
Test 500, 1000, 2000, 30000, 4000, and 6000 Hz.OSHA recommends testing 8000 Hz but not required.Most use supra-aural headphones.
What are 4 disadvantages to microprocessor audiometers? - CORRECT ANSWER: No
standardized protocol to present PTs.Variability may make it hard to compare results.Differences in thresholds could affect group STS rates.If equipment experiences a power surge, could lose records or damage equipment.
What are 4 specifics for the audiometer? - CORRECT ANSWER: ANSI S3.6 - 1996.
Earphones are calibrated to specific audiometers and should not be interchanged.Booth (standard test booth, mini-booth, or sound-treated space).SLM (w/octave band analyzer and calibrator).
- / 2