CAOHC Audiogram Review and STS 2

Question 1

What is the OSHA-defined standard threshold shift (STS)?

Accepted Answer

An average shift of 10 dB or more at 2000, 3000, and 4000 Hz in either ear

Answer

A shift of 15 dB at any single frequency

Answer

An average shift of 5 dB across all frequencies

Answer

A shift of 25 dB at 4000 Hz only

Question 2

When reviewing an audiogram, which pattern most strongly suggests noise-induced hearing loss?

Accepted Answer

A notch at 4000 Hz with recovery at 8000 Hz

Answer

Flat hearing loss across all frequencies

Answer

Low-frequency hearing loss below 1000 Hz

Answer

Conductive hearing loss in one ear only

Question 3

How often must OSHA-mandated audiometric testing be performed for workers in a hearing conservation program?

Accepted Answer

Annually

Answer

Every 6 months

Answer

Every 2 years

Answer

Only at hire and termination

Question 4

What action is required when an employee audiogram reveals a confirmed STS?

Accepted Answer

The employer must notify the employee in writing within 21 days

Answer

The employee must be immediately removed from the workplace

Answer

No action is required if the employee wears hearing protection

Answer

The employer must repeat the test within 72 hours

Question 5

What is the purpose of age correction in STS determination?

Accepted Answer

To account for expected hearing loss due to aging when calculating threshold shifts

Answer

To adjust audiometer calibration for older equipment

Answer

To modify testing procedures for elderly workers

Answer

To calculate the retirement age for noise-exposed workers

Question 6

A revised baseline audiogram should be substituted when which condition is met?

Accepted Answer

When an STS is persistent and the audiologist determines the new audiogram better represents the worker hearing

Answer

When the worker changes job positions within the company

Answer

When the audiometer is replaced with a newer model

Answer

Whenever the worker requests a new baseline