What Is A CD?

What "CD" Means on This Site

The acronym "CD" is shared by several unrelated credentials and products, which is exactly why a search for "what is a CD" returns a confusing mix of results. On this site, CD means one thing only: Course Director, the program administered by the Council for Accreditation in Occupational Hearing Conservation (CAOHC). The official program name is Course Director (CD), and it is also described as a CAOHC-approved Course Director.

If you arrived looking for a different meaning of the acronym, our short 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 earns it, what the exam involves, and how the pieces of the pathway fit together.

What a Course Director Actually Does

A Course Director is the qualified instructor responsible for conducting CAOHC-approved occupational hearing conservation courses. Those courses train the technicians who perform hearing screenings and related hearing-conservation tasks in workplaces. In other words, the CD is a credential for the person who teaches and oversees that training, not for the technician sitting in the classroom.

The five curriculum areas in the CD workshop describe the job well:

• Building OHC certification and recertification course curricula
• Running the procedures that surround each course, before, during and after delivery
• Teaching effectively and using hearing-conservation training resources
• Keeping courses current with federal regulatory changes
• Incorporating scientific and technical advances into instruction

Notice how administrative and pedagogical this list is. A Course Director needs technical command of hearing conservation, but the credential is fundamentally about running compliant, well-taught courses. For a broader orientation to the credential and its labels, see What Is CD Certification? and the overview at CD Certification.

Who Qualifies to Become a Course Director

Eligibility is front-loaded. CAOHC reviews your documentation and approves it before ordinary registration opens to you, so you cannot simply decide to sit the exam. The published requirements include:

• A qualifying current professional license or certification. The current web eligibility language includes physician assistants, while the November 2025 policy manual lists qualifying professions differently. If your profession is near the boundary, confirm approval directly with CAOHC rather than assuming.
• 1,000 relevant hours within five years, spread across at least three specified activities.
• A complete supervised OHC course, in person or hybrid, completed as adjunct faculty or practicum assistant.
• Documentation and verification letters, including credential documentation and letters from a supervisor or Course Director, approved before registration.

The supervised-course requirement is the part candidates most often underestimate. It means you need access to a Course Director who will let you serve as adjunct faculty or practicum assistant through a full course. Start arranging that early, because it depends on someone else's course schedule. Our CD requirements guide walks through the prerequisites in more detail.

How the CD 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 a ten-day completion window. That structure surprises people who expect a proctored, single-sitting test: it is not an eight-hour or 240-hour continuous exam, and you can stop and resume within the window.

Several details are simply not published, and you should treat any source claiming precision on them with suspicion. The exact question count, the split between scored and unscored items, and the specific item types are not publicly verified. The pass rate is not publicly disclosed either, which is why we address it carefully in CD pass rate: what the data shows. Calculator rules, adaptive testing, and CD-specific remote-proctoring rules are likewise unverified.

The 80% threshold deserves attention. An open-book format can create false confidence, but 80% is demanding when questions require applying regulatory and instructional concepts rather than looking up a single fact. You can read more on the cut score in CD passing score: exactly what you need to pass, and a candid difficulty assessment in how hard is the CD exam?

The Five Workshop Curriculum Areas

Preparation follows five published CAOHC Course Director workshop curriculum areas. An important caution: these are unweighted preparation topics drawn from the issuer's workshop description. They are not an official weighted or exhaustive exam blueprint, and there is no verified weighting you can use to allocate study hours by percentage. They are also entirely separate from the blueprint for the OHC student examination that technicians take. Our complete guide to the five CD content areas expands on each.

Fees and Registration Mechanics

The cost structure has a few moving parts, and the totals below are calculated from published component fees rather than a single advertised package price. The member versus non-member distinction is not published.

The eight-hour CD workshop is training time, and the virtual workshop is priced separately from the exam. Because approval of your eligibility documents comes before ordinary registration, build in time for CAOHC's review. A full breakdown with budgeting notes is in CD certification cost, and scheduling specifics are in CD exam dates.

Validity, Renewal and Extensions

A Course Director credential is valid for five years. Renewal can follow one of two routes:

1. Workshop plus exam, the standard renewal pathway.
2. The eligible exam-only route, which requires meeting at least two of the following four criteria:
   • Directing ten qualifying OHC courses
   • Two years of CAOHC committee or task-force service
   • Ten relevant CE contact hours
   • Teaching one approved CD workshop

Be careful with the CE criterion. Ten CE contact hours is only one of four options and is not a universal standalone renewal quota. Satisfying that item alone does not qualify you for the exam-only route; you need a second criterion as well.

Extensions of up to six months are discretionary. Your request must reach CAOHC at least 30 days before expiration, and a failed exam does not qualify you for an extension. Also remember that renewing a COHC credential is separate from renewing your Course Director status; keeping one current does not renew the other.

Course Director vs. COHC: Two Different Credentials

Because both live under the CAOHC umbrella, candidates frequently blur them. They serve different roles.

Holding one does not renew or substitute for the other. If you are weighing whether the instructor path suits your career, our analyses of whether the CD certification is worth it and the CD salary guide discuss the career context without inventing numbers the issuer does not publish. For the roles where this credential matters, see CD jobs.

Sequencing Your Preparation by Curriculum Area

You do not need a generic study system here; you need an order that respects how the five areas depend on each other. One sensible sequence for a four-week lead-up to the workshop and exam:

Regulation goes first because curriculum design and procedures only make sense against the rules that govern them. Practice-question allocations on our platform are editorial, not an official weighting, so balance your time by your own weak spots. A fuller approach is laid out in the CD study guide, and the CD cheat sheet compresses the key facts for last-minute review. When you are ready to test yourself, try the CD practice tests to see how scenario questions feel before you commit to an attempt.

Frequently Asked Questions