Identification of a standard threshold shift (STS) for individuals with a very poor sense of hearing.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.

November 17, 1989

Mr. Stephen Gee
System Designer
Formerly Environmental Health Associates
ENSR Health Sciences
1320 Harbor Bay Parkway Suite 100
Alameda, CA 94501

Dear Mr. Gee:

This is in response to your letter of October 12, 1989, addressed to MaryAnn Garrahan, concerning the identification of a standard threshold shift (STS) in hearing ability for individuals with a very poor sense of hearing.

Baseline audiogram revision due to persistent STS or improved thresholds; revision must be made for each ear separately.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.

May 8, 2003

Ms. Linda Ballas
Linda Ballas & Associates
4413 Copper Creek Lane
Toledo, OH 43615

Dear Ms. Ballas:

Revising baseline audiogram when there is a standard threshold shift in only one ear.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov.

September 9, 2005

Ms. Laurie Wells
President, National Hearing Conservation Association
7995 E. Prentice Avenue
Suite 100 East
Greenwood Village, CO 80111-2710

Dear Ms. Wells: