CD Pass Rate 2026: What the Data Shows

The Honest Answer: No Published Pass Rate

If you searched for the Course Director (CD) pass rate hoping for a single clean number, here is the direct answer: the Council for Accreditation in Occupational Hearing Conservation (CAOHC) does not publicly disclose one. There is no annual percentage, no cohort breakdown, and no first-time versus repeat-taker split in the public materials reviewed for this article.

That matters because pass rate pages across the internet tend to fill the silence with invented figures. This article takes the opposite approach. It explains what the data actually shows, what it cannot show, and how the structure of the CD credential itself tells you more about your odds than any rumored percentage could.

If you want the full picture of how the credential works, start with our overview of what CD certification is, then return here to see how the exam mechanics translate into practical risk.

Why a Course Director Pass Rate Is Hard to Produce

Large, high-volume exams often publish pass rates because thousands of candidates sit them each year. The Course Director credential is different. It is an instructor-level qualification tied to a specialized field, occupational hearing conservation, and the candidate pool is small and highly self-selected.

Several structural reasons explain why a meaningful pass rate is difficult to calculate or publish:

• Small candidate volume. Instructor-level credentials in a niche discipline simply do not generate the sample sizes that make a percentage statistically stable.
• Pre-screened applicants. Only people who have already cleared eligibility review are allowed to register, so the pool is far from a random sample of professionals.
• Bundled workshop and exam. Many candidates take the CD workshop and exam together, and the issuer may track completion in ways that do not map to a simple pass/fail ratio.
• Multiple pathways. Initial candidates, renewal candidates, and eligible exam-only renewers all face different circumstances, which would muddy any blended figure.

A single published percentage would blend all of these groups together and say very little about your individual situation. Understanding how hard the CD exam is requires looking at format and prerequisites rather than chasing a statistic that does not exist publicly.

What Is Publicly Known About the Exam

While the pass rate is undisclosed, several concrete exam facts are verifiable from CAOHC's public materials, which were reviewed as of September 29, 2026.

Format and delivery

The CD exam is delivered online through the CAOHC Learning Center. It is open-book, which changes how you should think about difficulty. Because you can consult materials, the exam rewards candidates who know where information lives and can apply it, rather than those who simply memorize isolated facts. Progress is saved, and candidates have a ten-day completion window. This is not a continuous multi-hour sitting, and it is not an eight-hour or 240-hour exam; the eight-hour element refers to the CD workshop, which is training time rather than testing time.

Scoring and attempts

The passing score is 80%. Candidates get two attempts within the window. If both attempts end in failure, the candidate must repeat both the workshop and the exam. For a deeper look at what 80% means in practice, see our guide to the CD passing score.

What is not verified

Several details are not publicly confirmed, and it is better to say so plainly:

• The total number of exam questions and the split between scored and unscored items.
• The exact item types used.
• Whether calculators are permitted, whether the exam is adaptive, and any CD-specific remote-proctoring rules.
• An official weighted exam blueprint with percentage allocations per domain.

The Filters That Happen Before You Ever Test

The most important reason to be skeptical of a raw pass rate is that CAOHC screens candidates heavily before they can register. By the time someone reaches the exam, they have already demonstrated substantial professional experience. That front-loaded filtering is a major driver of outcomes and is arguably more selective than the exam itself.

Ordinary registration requires that eligibility documentation be approved first. The requirements include:

• A qualifying current professional license or certification.
• 1,000 relevant hours of occupational hearing conservation work within the last five years, spanning at least three specified activities.
• Completion of a full supervised in-person or hybrid OHC course, serving as adjunct faculty or practicum assistant.
• Credential documentation plus supervisor or CD verification letters.

One nuance worth flagging: current web eligibility language includes physician assistants, while the November 2025 policy manual list differs. If your profession sits near that boundary, confirm approval with CAOHC directly rather than assuming. Our full walkthrough of CD requirements covers the documentation steps in detail.

What a Failed Attempt Really Costs

The meaningful risk in the CD process is not a mystery percentage; it is the consequence structure. You have two attempts within the ten-day window. Passing on either one completes the exam. But failing both is expensive in both money and time, because you must repeat the workshop and the exam.

Using the published fees, the initial exam costs $200, and the virtual workshop scheduled for October 16, 2026 is separately $500. By calculation, that makes a $700 total for the initial path. Repeating the workshop and exam after a double failure would therefore reset a significant portion of that investment. For the complete pricing picture, including renewal routes, see our CD certification cost breakdown.

Where Candidates Are Most Likely to Lose Points

CAOHC has not published a weighted blueprint, so we cannot say which area carries the most points. What we can do is identify the five published CD workshop curriculum areas and flag where preparation typically needs the most care. These are unweighted issuer-course topics, not an official exam blueprint, and they are distinct from the separate OHC student examination blueprint. Our complete guide to the five CD content areas goes deeper on each.

In general, the areas most likely to cause trouble are those that require current, changing knowledge, particularly federal regulatory changes and scientific advances, because these are harder to cram from static notes. Procedural questions in Domain 2 can also trip up candidates who have never run the administrative side of a course.

Fees and Attempts at a Glance

This table summarizes the verified cost and attempt mechanics that frame your real risk. Totals are calculated from published figures, and member versus non-member pricing distinctions are not published.

If you are weighing whether the investment makes sense for your career, our analysis of whether the CD certification is worth it and the CD salary guide can help frame the return.

A Domain-Ordered Preparation Plan

Since the exam is open-book and the window is ten days, your preparation should focus on building a navigable mental map of the five areas rather than memorizing line by line. The plan below orders the domains deliberately: foundational structure first, then the changing material that benefits from the freshest review closest to test day. For a fuller approach, see our CD study guide and keep the CD cheat sheet handy for quick review.

To pressure-test your readiness across every area, work through scenario-style questions on the CD practice test site, which lets you spot weak domains before you commit to your two attempts.

How to Read Pass Rate Claims You Find Online

Because no official figure exists publicly, any specific CD pass rate you encounter should be treated with caution. Ask these questions before trusting a number:

1. Does it cite CAOHC directly? If the source cannot point to an issuer publication, the number is speculation.
2. Does it match the right credential? Several unrelated credentials use the same acronym, and statistics from those do not apply to the Course Director qualification. Always confirm the figure refers to the CAOHC Course Director program.
3. Is it dated? Policy details change; the manual referenced here was revised in November 2025.
4. Does it distinguish candidate types? Initial, renewal and exam-only renewal candidates are different populations.

For background on the terminology confusion itself, our explainers on what CD stands for and what CD is clarify exactly which credential this site covers. If you are still evaluating the role, CD jobs and CD training describe where the qualification is applied.

Renewal is also part of the long-term picture. The credential is valid for five years, and renewal is possible through a workshop plus exam or an eligible exam-only route requiring at least two of the following: ten qualifying OHC courses directed, two years of CAOHC committee or task-force service, ten relevant CE contact hours, or one approved CD workshop taught. Extensions of up to six months are discretionary, require a request at least 30 days before expiration, and do not apply to failed exams. Our CD exam dates guide covers timing, and a separate COHC renewal remains its own process.

Frequently Asked Questions