CAOHC Exam Study
#Days to notify individual of an STS in writing - ANS-21 days
\1000 Hz retest - ANS-Done as a validity check on first ear tested; thresholds should be
within 5dB or should reinstruct patient and start test over
\3 foot rule - ANS-Good rule of thumb to recognize hazardous noise exposure
levels/situations: the rule is: if you have to shout at arms length (~3ft), in order to be
understood over the background noise, then you're likely exposed to hazardous noise levels
& should be wearing hearing protection to prevent NIHL
\A check of audiometer performed daily to ensure there are no intermittent problems with
hardware is called a: - ANS-Functional Check
\Administrative noise controls - ANS-Changes made by employer such as changing work
schedules to reduce noise hazard risk to employees
\Audiometric zero is: - ANS-0 dB HL; this is not an absence of sound
HL scale has been normalized to healthy adult hearing
\Auditory effects of noise - ANS-NIHL; tinnitus; hyperacusis
\Baseline Hearing Test Must Be Done Within - ANS-6 months of starting employment
(exception for mobile vans is up to 1 year)
\Best audiometer for testing difficult-to-test patients - ANS-Manual Audiometer
\Best audiometer for testing multiple stations - ANS-Microprocessor Audiometer
\Best hearing protection - ANS-The one that is worn (consistently and properly)
\Calibration of audiometer performed daily with a electroacoustic simulator or human ear is
called a: - ANS-Biologic calibration
\Cochlea - ANS-A coiled, bony, fluid-filled tube in the inner ear through which sound waves
trigger nerve impulses; damage from hazardous noise occurs here.
\Collapsing ear canal - ANS-Occurs naturally in some individuals during audiometric
testing-earphones cause auricle to move forward collapsing the canal and causing an
artificial hearing loss; Insert earphones should be used
\Conductive HL occurs here - ANS-Outer or middle ear
\Dual hearing protection NRR - ANS-After derating add additional 5dB of protection
\Elements of a Hearing Conservation Program - ANS-Mandatory and includes: exposure
monitoring, audiometric testing, hearing protection, employee training, record keeping, and
program evaluation
\Elements of a Hearing Conservation Program - ANS-Noise hazard assessment;
engineering/administrative controls; annual hearing monitoring; annual training/education;
hearing protection; recordkeeping
\Eustachian tube (auditory tube) - ANS-Tube connecting the middle ear to the pharynx and
equalizes middle ear space with atmospheric pressure
\Excessive noise levels will impact these test frequencies during a hearing exam - ANS-Low
frequencies e.g. 500 Hz
\First frequency always tested on an occupational hearing exam - ANS-1000 Hz
\Formable Earplugs are: - ANS-Disposable when no longer return to shape and soiled
\Function of the Inner Ear - ANS-Convert mechanical sound waves to neural impulses that
can be recognized by the brain for hearing and balance
#Days to notify individual of an STS in writing - ANS-21 days
\1000 Hz retest - ANS-Done as a validity check on first ear tested; thresholds should be
within 5dB or should reinstruct patient and start test over
\3 foot rule - ANS-Good rule of thumb to recognize hazardous noise exposure
levels/situations: the rule is: if you have to shout at arms length (~3ft), in order to be
understood over the background noise, then you're likely exposed to hazardous noise levels
& should be wearing hearing protection to prevent NIHL
\A check of audiometer performed daily to ensure there are no intermittent problems with
hardware is called a: - ANS-Functional Check
\Administrative noise controls - ANS-Changes made by employer such as changing work
schedules to reduce noise hazard risk to employees
\Audiometric zero is: - ANS-0 dB HL; this is not an absence of sound
HL scale has been normalized to healthy adult hearing
\Auditory effects of noise - ANS-NIHL; tinnitus; hyperacusis
\Baseline Hearing Test Must Be Done Within - ANS-6 months of starting employment
(exception for mobile vans is up to 1 year)
\Best audiometer for testing difficult-to-test patients - ANS-Manual Audiometer
\Best audiometer for testing multiple stations - ANS-Microprocessor Audiometer
\Best hearing protection - ANS-The one that is worn (consistently and properly)
\Calibration of audiometer performed daily with a electroacoustic simulator or human ear is
called a: - ANS-Biologic calibration
\Cochlea - ANS-A coiled, bony, fluid-filled tube in the inner ear through which sound waves
trigger nerve impulses; damage from hazardous noise occurs here.
\Collapsing ear canal - ANS-Occurs naturally in some individuals during audiometric
testing-earphones cause auricle to move forward collapsing the canal and causing an
artificial hearing loss; Insert earphones should be used
\Conductive HL occurs here - ANS-Outer or middle ear
\Dual hearing protection NRR - ANS-After derating add additional 5dB of protection
\Elements of a Hearing Conservation Program - ANS-Mandatory and includes: exposure
monitoring, audiometric testing, hearing protection, employee training, record keeping, and
program evaluation
\Elements of a Hearing Conservation Program - ANS-Noise hazard assessment;
engineering/administrative controls; annual hearing monitoring; annual training/education;
hearing protection; recordkeeping
\Eustachian tube (auditory tube) - ANS-Tube connecting the middle ear to the pharynx and
equalizes middle ear space with atmospheric pressure
\Excessive noise levels will impact these test frequencies during a hearing exam - ANS-Low
frequencies e.g. 500 Hz
\First frequency always tested on an occupational hearing exam - ANS-1000 Hz
\Formable Earplugs are: - ANS-Disposable when no longer return to shape and soiled
\Function of the Inner Ear - ANS-Convert mechanical sound waves to neural impulses that
can be recognized by the brain for hearing and balance
