- What CD Means on This Site
- Who Issues the Credential and Why It Exists
- Who Qualifies to Apply
- How the Exam Works
- The Five Curriculum Areas You Prepare Around
- Fees, Workshop Pricing and Timing
- Five-Year Validity and Renewal Paths
- Where the Credential Fits in Hearing Conservation Careers
- Sequencing Your Preparation by Topic Area
- Frequently Asked Questions
- CD here means Course Director, the CAOHC credential for instructors who teach occupational hearing conservation (OHC) certification courses.
- The exam is online and open-book, with saved progress, a ten-day completion window, and an 80% passing score.
- Initial exam fee is $200, renewal exam is $150, and the separate October 16, 2026 virtual workshop is $500.
- Applicants need 1,000 relevant hours within five years, a supervised OHC course experience, and approved verification letters before registering.
What CD Means on This Site
The acronym "CD" is shared by several unrelated credentials and terms, so it is worth stating precisely what this article covers. On this site, CD means Course Director: the instructor-level qualification issued by the Council for Accreditation in Occupational Hearing Conservation (CAOHC). It is formally described as the CAOHC-approved Course Director, and some materials refer to the holder as a Certified Course Director.
If you are searching for other meanings of the abbreviation, our explainers on what CD stands for and CD meaning cover the naming question directly. This article focuses on the credential itself: what it is, who it is for, how the exam is structured, and what it takes to earn and keep it.
Who Issues the Credential and Why It Exists
CAOHC is the body that sets the standards for occupational hearing conservation training. Its certification courses prepare technicians, nurses, audiologists, safety professionals and others to run workplace hearing conservation programs, including audiometric testing, noise exposure assessment, hearing protector selection and program recordkeeping. Those courses need qualified leaders, and the Course Director credential is how CAOHC identifies them.
In practical terms, a Course Director is responsible for how an approved OHC course is built, delivered and documented. That includes curriculum decisions, instructional quality, compliance with CAOHC procedures, and the administrative steps before, during and after each course. The credential is less about personal clinical skill and more about instructional leadership within a standardized training framework.
For a broader orientation to the credential family, see our overview of CD certification and the companion piece what CD certification is.
Who Qualifies to Apply
Eligibility is the most demanding part of the process, and it is front-loaded. You do not simply register for an exam. You apply, submit documentation, and receive approval before ordinary registration opens to you. The published requirements include:
- A qualifying current professional license or certification. The current web listing of eligible professions includes physician assistants, while the November 2025 policy manual's list differs. If your profession sits near the boundary, confirm approval with CAOHC before investing in the workshop.
- 1,000 relevant hours within the past five years, spread across at least three of the specified activity categories.
- A complete supervised OHC course taken in person or hybrid, in which you served as adjunct faculty or practicum assistant.
- Credential documentation plus verification letters from a supervisor or a current Course Director.
All of these must be approved before ordinary registration. The detailed breakdown, including how to document hours, lives in our CD requirements guide.
How the Exam Works
The Course Director exam is delivered online through the CAOHC Learning Center. It is an open-book exam with saved progress, and you have ten days to complete it once you begin the window. It is not an eight-hour sitting and it is not a continuous timed marathon; the eight-hour block associated with this credential is the CD workshop, which is training time rather than testing time.
Key format facts that are published:
- Passing score: 80%.
- Attempts: two within the completion window.
- If both attempts fail: you must repeat the workshop and the exam.
Several details are not publicly verified, and we would rather say so than guess. These include the exact number of questions, how many are scored versus unscored, the precise item types, whether a calculator is permitted, whether the exam is adaptive, and any CD-specific remote-proctoring rules. The pass rate is also not publicly disclosed, so any figure you see quoted elsewhere should be treated with suspicion. Our pass rate analysis explains what can and cannot be said with the available evidence, and the passing score guide walks through the 80% threshold and the two-attempt rule.
What "open-book" really changes
An open-book format shifts the challenge from recall to navigation and judgment. You will not be rewarded for memorizing isolated numbers, but you will be rewarded for knowing where CAOHC's requirements live, how to interpret them, and how to apply them to an instructor's decisions. Candidates who treat open-book as "easy" tend to run into trouble with scenario-style items that require applying a procedure correctly rather than locating a sentence.
For a realistic sense of effort, read how hard the CD exam is.
The Five Curriculum Areas You Prepare Around
CAOHC publishes five curriculum areas for the Course Director workshop. These are the topics the course description covers, and they are the sensible spine for your preparation. An important caveat: they are unweighted preparation topics from the issuer's course, not an official weighted or exhaustive exam blueprint. CAOHC has not published domain weights for the exam, and these five areas should not be confused with the separate blueprint used for the OHC student examination.
Domain 1: Developing OHC certification and recertification course curricula
Focuses on how a Course Director structures an approved course so that it meets CAOHC's content expectations for both initial certification and recertification offerings.
- Differences between certification and recertification course design
- Aligning course content and timing with CAOHC requirements
- Building a curriculum that supports both lecture and practicum components
Domain 2: Course Director procedures before, during and after OHC courses
Covers the administrative and operational responsibilities that surround every course session.
- Pre-course approvals, materials and logistics
- In-course oversight, attendance and practicum supervision
- Post-course documentation and reporting obligations
Domain 3: Effective teaching techniques and hearing-conservation training resources
Addresses how to teach adult professionals effectively and which resources support that instruction.
- Instructional methods suited to technical, regulation-heavy content
- Selecting and using training resources appropriately
- Handling mixed-experience classes and practicum coaching
Domain 4: Federal regulatory changes affecting OHC courses
Keeps instructors current on regulatory developments that shape what must be taught.
- Recognizing when regulatory updates require course content changes
- Communicating regulatory context accurately to students
- Staying current rather than relying on outdated course materials
Domain 5: Scientific and technical advances in hearing-conservation instruction
Covers emerging science and technology that influence how hearing conservation is taught.
- Incorporating new technical developments into instruction
- Evaluating the credibility of new methods and equipment
- Balancing established practice with newer approaches
A deeper treatment of each area, with the reasoning behind how they relate, is in our CD exam domains guide.
Fees, Workshop Pricing and Timing
The fee structure separates the workshop from the exam, which surprises some candidates who expect a single bundled price. The published figures, in US dollars, are:
| Pathway | Components | Total |
|---|---|---|
| Initial certification | $200 exam + $500 virtual workshop | $700 (by calculation) |
| Renewal with workshop | $150 renewal exam + $500 workshop | $650 (by calculation) |
| Eligible exam-only renewal | $150 renewal exam | $150 |
The virtual workshop is scheduled for October 16, 2026. The totals above are our own arithmetic from the published component fees, not a single price CAOHC advertises. CAOHC does not publish a member versus non-member fee distinction for this credential, so do not assume a discount exists. For the full picture including incidental costs, see the CD certification cost breakdown, and for scheduling specifics see CD exam dates and deadlines.
Key Takeaway
Budget for the workshop and the exam as two separate line items, and confirm your eligibility approval first. Paying fees before your documentation and verification letters are approved risks timing problems you cannot easily reverse.
Five-Year Validity and Renewal Paths
The Course Director credential is valid for five years. You renew by one of two routes:
- Workshop plus exam: attend the CD workshop and pass the renewal exam.
- Eligible exam-only route: take the renewal exam without the workshop, provided you meet at least two of four activity criteria.
The four criteria for the exam-only route are:
- Directing ten qualifying OHC courses
- Two years of service on a CAOHC committee or task force
- Ten relevant continuing education contact hours
- Teaching one approved CD workshop
Notice that ten CE hours is only one of four options and you must satisfy two. It is not a universal standalone renewal requirement, a mistake that circulates frequently. Directing courses actively is the most natural way for working Course Directors to qualify, since the activity you do anyway counts toward renewal.
Extensions and failed attempts
CAOHC may grant extensions of up to six months, but they are discretionary, and the request must be submitted at least 30 days before your expiration date. A failed exam does not qualify you for an extension. Keep in mind that renewing your Course Director credential does not renew any COHC credential you hold; that is a separate process.
Where the Credential Fits in Hearing Conservation Careers
Course Directors work where occupational hearing conservation training is delivered. That generally means organizations that run CAOHC-approved courses: training providers, occupational health practices, audiology and safety consulting firms, and employers or institutions that maintain their own hearing conservation training. For many holders, the credential is an added qualification layered on a primary profession such as nursing, audiology, industrial hygiene or safety, rather than a standalone job title.
Because of that, compensation depends heavily on the underlying profession and the employer rather than on the credential alone, and no verified earnings figure is available for the credential specifically. Our salary guide discusses how to reason about this without invented numbers, CD jobs describes the settings where Course Directors work, and the ROI analysis helps you weigh the roughly $700 initial outlay against your own situation.
Sequencing Your Preparation by Topic Area
Because the exam is open-book and the topics are unweighted, a good plan builds familiarity with where answers live and how procedures connect. One sensible sequence, tied directly to the five areas:
Procedures first
- Work through Domain 2, since pre-, during- and post-course procedures anchor everything else
- Read the current policy manual (revised November 2025) end to end
Curriculum design
- Study Domain 1, comparing certification and recertification course structures
- Map how procedures from Week 1 attach to each course type
Teaching and resources
- Cover Domain 3 using scenario thinking: what would you do with a struggling practicum student?
Regulation and science
- Review Domains 4 and 5 together, since both concern keeping content current
- Finish with mixed practice questions across all five areas
Starting with procedures works because the policy manual is the document you will consult most during an open-book attempt, so familiarity with its layout pays off immediately. For a fuller method, see the CD study guide, keep the CD cheat sheet handy for quick review, and use the CD practice tests to rehearse applying procedures to realistic scenarios. If you want structured question drills organized by topic, the main practice test site is built for that.
Frequently Asked Questions
It stands for Course Director, the CAOHC credential for instructors authorized to lead occupational hearing conservation certification courses. It is unrelated to other credentials that share the abbreviation.
The exam is delivered online through the CAOHC Learning Center as an open-book assessment with saved progress. Whether an outside vendor or specific remote-proctoring rules apply is not publicly verified, so confirm directly with CAOHC.
You have two attempts within the ten-day completion window, and you need 80% to pass. If both attempts fail, you must repeat both the workshop and the exam.
Possibly. An eligible exam-only renewal costs $150 and requires meeting at least two of four activity criteria: ten qualifying courses directed, two years of CAOHC committee service, ten relevant CE hours, or one approved CD workshop taught.
No. COHC renewal is a separate process with its own requirements. Maintaining both credentials means tracking two independent renewal cycles.