- The Passing Standard: A Scaled 70, Not 70% Correct
- Three Modules, Three Separate Passing Decisions
- How the Computer-Adaptive Format Shapes Your Result
- Where Score Points Come From: The 11 Domains
- Reading the 2025 First-Attempt Pass Rates Correctly
- From Passing Scores to Actual Certification
- What a Failed Module Costs You
- A Study Sequence Built Around the Scaled Score
- Frequently Asked Questions
- Each Dipl.C.H. module requires a scaled score of 70 on a 1-99 scale, not 70% of questions correct.
- You must pass three separate exams: Foundations of Oriental Medicine, Biomedicine and Chinese Herbology, each with 100 questions.
- Questions cannot be skipped or revisited, so every answer is final the moment you submit it.
- Official 2025 first-attempt pass rates for Route 1 candidates were FOM 92.2%, BIO 68.7% and CH 62.3%.
The Passing Standard: A Scaled 70, Not 70% Correct
The single most misunderstood fact about the Diplomate in Chinese Herbology credential is what "70" means. The National Certification Board for Acupuncture and Herbal Medicine (NCBAHM), formerly the National Certification Commission for Acupuncture and Oriental Medicine (NCCAOM), reports results on a scaled score from 1 to 99, and the passing standard on each module is a scaled score of 70. That is not the same as answering 70 of 100 questions correctly.
A scaled score is a mathematical transformation of your raw performance. Because the exams include scored and unscored pretest questions, and because the adaptive format selects items differently for different candidates, a raw count of correct answers is not directly comparable from one candidate to the next. Scaling places everyone on the same measurement ruler so that a 70 represents the same level of demonstrated competence regardless of which questions you happened to see.
If you want a broader sense of how difficult candidates find the modules, our complete difficulty guide for the Dipl.C.H. exam walks through where preparation tends to break down.
Three Modules, Three Separate Passing Decisions
There is no single "Dipl.C.H. exam" with one pass/fail line. The complete credential requires three board examinations, each scheduled separately year-round through Pearson VUE, each delivered in English, each with 100 multiple-choice questions and a 2-hour-30-minute time limit:
| Module | Domains Covered | Questions | Time Limit | Passing Standard |
|---|---|---|---|---|
| Foundations of Oriental Medicine (FOM) | Domains 1-3 | 100 | 2 hr 30 min | Scaled score of 70 (1-99) |
| Biomedicine (BIO) | Domains 4-7 | 100 | 2 hr 30 min | Scaled score of 70 (1-99) |
| Chinese Herbology (CH) | Domains 8-11 | 100 | 2 hr 30 min | Scaled score of 70 (1-99) |
In aggregate that is 300 questions and 7 hours 30 minutes of testing, spread across separate appointments. Each module stands alone: a strong FOM result does not offset a weak CH result, and there is no compensatory averaging. You need a 70 on all three.
Note that the aggregate figure covers only the three board examinations. It excludes the prerequisite Clean Needle Technique (CNT) written and practical assessments and all course hours. For the eligibility pathway that gets you to the testing room in the first place, see our guide to Dipl.C.H. eligibility and prerequisites.
How the Computer-Adaptive Format Shapes Your Result
Each module is a computer-adaptive examination. For a candidate, three format rules matter more than any abstract scoring theory:
- You cannot skip questions. Every item must be answered before you advance.
- You cannot return to previous answers. Once submitted, a response is locked.
- The test is closed-book. Personal reference materials and calculators are prohibited.
This changes how you should practice. In a paper-style exam, you can flag a hard item and come back to it. Here, you cannot. The strategy of "bank the easy points first" does not exist, so your practice must train you to commit to a best answer, release the question and move on without second-guessing.
Each exam also mixes scored items with unscored pretest questions. You will not be told which is which. Treat every question as if it counts, because from your seat you cannot tell the difference, and a question that feels strangely obscure may simply be an unscored trial item. Do not let one baffling question drain time and composure from the ones that follow.
Where Score Points Come From: The 11 Domains
The scaled score reflects performance across each module's content blueprint. The 2026 content outlines, effective September 1, 2026 and based on the 2024 Job Analysis, define 11 exam objectives distributed across the three modules. Each module has its own 100% blueprint, so the percentages below describe weighting within a module, not across the whole credential. Do not add them together or normalize them into credential-wide allocations.
Foundations of Oriental Medicine (FOM)
Three domains, each weighted within the FOM blueprint:
- Domain 1: Patient Assessment Methods (28%)
- Domain 2: Pathomechanisms and Pattern Differentiation (38%)
- Domain 3: Treatment Planning (34%)
Pathomechanisms and Pattern Differentiation is the largest FOM domain at 38%. A candidate who can reason from signs and symptoms to a pattern and its underlying mechanism has the strongest lever on this module's score.
Biomedicine (BIO)
Four domains within the BIO blueprint:
- Domain 4: Biomedical Sciences (18%)
- Domain 5: Patient Evaluation (26%)
- Domain 6: Analysis and Clinical Decision-making (34%)
- Domain 7: Professional Responsibilities (22%)
Analysis and Clinical Decision-making carries the most weight at 34%. This module rewards applied clinical judgment more than memorized science facts alone.
Chinese Herbology (CH)
Four domains within the CH blueprint:
- Domain 8: Chinese Herbs, Herbal Combinations and Herbal Formulas (22%)
- Domain 9: Safety and Quality Control (24%)
- Domain 10: Treatment Planning and Administration (30%)
- Domain 11: Treatment Evaluation and Modification (24%)
Treatment Planning and Administration leads at 30%. Notably, the herb-and-formula knowledge domain is not the heaviest; safety, planning and evaluation together outweigh it. Appendix herb lists in the CH outline are not exhaustive, so treat them as a starting framework rather than a closed set.
For a domain-by-domain breakdown of what each content area tests, see our complete guide to all 11 Dipl.C.H. content areas.
Reading the 2025 First-Attempt Pass Rates Correctly
Official 2025 first-attempt pass rates for Route 1 candidates (U.S. formal-education applicants) were:
| Module | 2025 First-Attempt Pass Rate (Route 1) |
|---|---|
| Foundations of Oriental Medicine (FOM) | 92.2% |
| Biomedicine (BIO) | 68.7% |
| Chinese Herbology (CH) | 62.3% |
These numbers are useful, but they come with limits you should respect. They are historical results for separate module cohorts under the prior outline. They are not a whole-credential pass rate, and they are not a prediction for the 2026 outline that takes effect September 1, 2026. A candidate cannot multiply the three percentages to estimate an overall chance of success, because the cohorts differ.
What the numbers do tell you is where candidates historically struggled. FOM was passed comfortably by most first-time Route 1 candidates, while BIO and especially CH produced materially more first-attempt failures. If you are budgeting preparation time, that pattern argues for giving CH and BIO the larger share. For a fuller treatment, read our analysis of what the Dipl.C.H. pass-rate data shows.
Key Takeaway
The lowest historical first-attempt rate belonged to Chinese Herbology (62.3%). Because the heaviest CH domain is Treatment Planning and Administration at 30%, spend serious practice time on applied planning scenarios, not only on herb and formula recall.
From Passing Scores to Actual Certification
Here is a trap that catches careful candidates: passing the examinations does not by itself award certification. Certification is granted only after all required documents are accepted. Specifically, an official graduation transcript and an approved CCAHM Clean Needle Technique certificate must be submitted directly by the respective institutions before you are approved to test, and the file must be complete before the credential is issued.
Three timing rules also bear on your scores:
- All required examinations must be completed within the four-year application period.
- CNT generally must be completed within six years of the application, with handbook provisions for previously completed CNT and continuous licensure.
- Certification is separate from state licensure. A passing score and the Dipl.C.H. designation do not themselves authorize practice in any state.
Because the four-year window runs across all three modules, you have flexibility to sequence them, but a failed attempt consumes calendar time as well as money. For scheduling context, see our guide to Dipl.C.H. testing windows and scheduling.
What a Failed Module Costs You
The current Applicant Fees page lists USD $550 for the CH application and $350 per examination module, paid to Pearson VUE. That produces a calculated $1,600 for the application plus three first attempts, before education, preparation, CNT and other costs.
Using only those figures, a module you must retake adds a further $350 for the new attempt. That is the practical price of treating the first sitting as a "trial run." One fee note for accuracy: the linked January 2024 Certification Handbook retains older figures ($525 application and $325 per examination), while the amounts above follow the current dedicated fee pages. When the two conflict, plan around the current fee page and confirm at registration.
For the full financial picture, including everything outside the exam fees, see our complete Dipl.C.H. cost breakdown.
A Study Sequence Built Around the Scaled Score
Because each module demands its own 70 and the historical failure risk concentrates in BIO and CH, a sensible sequence allocates time by module weight and difficulty. This is one illustrative way to order a preparation block, tied to the specific domains above:
FOM Foundation
- Concentrate on Pathomechanisms and Pattern Differentiation (38% of FOM) first.
- Run untimed pattern-to-mechanism reasoning, then add Patient Assessment Methods and Treatment Planning.
BIO Judgment
- Prioritize Analysis and Clinical Decision-making (34% of BIO).
- Layer in Patient Evaluation, then Professional Responsibilities and Biomedical Sciences.
CH Depth
- Give the longest stretch to Treatment Planning and Administration (30% of CH) and Safety and Quality Control (24%).
- Work herbs, combinations and formulas as inputs to planning decisions, not isolated lists.
Timed, No-Backtrack Simulation
- Sit full 100-question, 150-minute sessions with no skipping and no returning to answers.
- Review misses by domain and rebalance the remaining time.
For a complete preparation framework beyond this sequence, use our Dipl.C.H. study guide for first-attempt success, and keep our one-page review of must-know facts handy for final-week consolidation.
Frequently Asked Questions
You need a scaled score of 70 on a 1-99 scale for each of the three modules: Foundations of Oriental Medicine, Biomedicine and Chinese Herbology. This is a scaled standard, not 70% of questions answered correctly.
The three modules are scheduled and scored separately, and a result on one does not offset another. All required examinations must be completed within the four-year application period, and certification is awarded only once all required documents are accepted.
No. The computer-adaptive format does not allow skipping, and you cannot return to previous answers. Each response is final once submitted, and the exam is closed-book with no personal references or calculators permitted.
No. The 2025 first-attempt rates for Route 1 candidates (FOM 92.2%, BIO 68.7%, CH 62.3%) are historical results for separate cohorts under the prior outline. They are not a whole-credential rate or a forecast for the outline effective September 1, 2026.
No. Certification is separate from state licensure. Passing the examinations also does not award certification on its own; the credential is issued only after all required documents, including your official transcript and approved CNT certificate, are accepted.
Master the blueprint, practice under the same no-backtrack conditions you will face on test day, and treat the scaled 70 as a competence standard across each module rather than a percentage to chase. For related reading, see whether the Dipl.C.H. certification is worth it, or start applying these ideas with the Dipl.C.H. practice questions.