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Course Director

CD Training for the OHC Standardized Exam

Over the past four years CAOHC has made a concentrated effort to standardize the OHC exam and bring more credibility to the designation Credentialed Occupational Hearing Conservationist (COHC). During this time a Task Force comprised of OHCs, CDs and PS’ have gone through a process to assure that the exam is legally defensible and that the process corresponds with both American National Standards Institute (ANSI) and International Organization for Standardization (ISO) standards. By following a methodology sanctioned by ANSI and the Institute for Credentialing Excellence (ICE), CAOHC has completed the following steps:

  1. Creation of a Job Task Analysis and deployment of a survey
  2. Creation of Exam Blueprint
  3. Creation of Certification and Recertification exam items (questions) from the blueprint.
  4. Beta testing of the exam items through the assistance of several CD and their volunteer students, using two versions of the Certification exam and one version of the Recertification exam.
  5. Evaluation of the Beta Testing results in terms of process and exam item performance to determine an appropriate cut-score for each exam.
  6. Administration of a “Soft Launch” to test the new process.

**Changes Now Effective**

OHC Certification Course Schedule

Audiometric practicum must be a MINIMUM of 150 minutes (2.5 hours) for the 20-hour course and 60 minutes for the 8-hour course. Hearing Protection practicum must be a MINIMUM of 60 minutes for the 20-hour course and 30 minutes for the 8-hour course.

Unlike the audiometric and hearing protection practica, there are no mandatory times assigned to the instruction of the 11 exam domains. Suggested times are provided and encouraged but individual CDs may adjust the schedule according to their needs. Certification courses must include a MINIMUM of 20 hours instruction including all required practicum and examination time.

CAOHC strongly recommends limiting instruction time to 8 hours per day as it may cause a strain on the attention and comprehension of the students, and strain the instructors as well.

Course Directors revised faculty policy

CDs will continue to provide the appropriate faculty. The CD must be physically present during the entire course. Practicum assistants must be physically present during the audiometric and hearing protection practica.

Course Directors will no longer create their own exam

Course Directors no longer score their exams; all OHC Standardized Certification and Recertification Exams are scored by the CAOHC administrative office

Course Directors will pay for all students when exams for each course are submitted


If you have not participated in a training session please contact the CAOHC administrative office for further information or participate in the training by listening to a recording of the presentation by clicking here.

Contact the administrative office for further details and any questions: call (414) 276-5338 or email Kim Stanton at kstanton@caohc.org.