Noise Exposure and Hearing Conservation Programs Flashcards

A standard threshold shift (STS) is defined as an average change from baseline of how many dB at 2000, 3000, and 4000 Hz in either ear?

Answer: 10 dB or more

OSHA defines an STS as an average shift of 10 dB or more at 2000, 3000, and 4000 Hz in either ear.

For an STS to be recordable on the OSHA 300 log, the employee's average hearing level at 2000, 3000, and 4000 Hz must also be at least how far above audiometric zero?

Answer: 25 dB

Under 1904.10, an STS is recordable when the average hearing level is also 25 dB or more above audiometric zero in the same ear.

How many hours of quiet should precede a baseline audiogram?

Answer: 14 hours

Baseline testing must be preceded by at least 14 hours without workplace noise exposure, which hearing protectors can satisfy.

Within what time frame must an employer establish a valid baseline audiogram after an employee's first exposure at or above the action level (without a mobile test van)?

Answer: 6 months

OSHA requires a baseline audiogram within 6 months of first exposure at or above the action level.

After an STS is confirmed, the employer must notify the employee in writing within how many days?

Answer: 21 days

OSHA requires written notification within 21 days of determining an STS.

An employer may obtain a retest to confirm a suspected STS within what period?

Answer: 30 days

A retest within 30 days may be used and treated as the annual audiogram to confirm or rule out an STS.

Who may perform audiometric testing in a hearing conservation program?

Answer: A licensed audiologist, otolaryngologist, physician, or a technician certified by CAOHC or demonstrating competence

OSHA allows qualified professionals or competent technicians, such as CAOHC-certified technicians, to conduct tests.