- What the DACVS Credential Actually Is
- Where Phase I Fits in the Pathway
- Who Can Sit for Phase I
- Exam Format and Test-Day Rules
- The Four Official Examination Disciplines
- Knowledge-Area Weights by Animal Form
- 2027 Registration, Fees and Dates
- How Phase I Is Scored
- Sequencing Your Preparation Around the Blueprint
- Keeping the Credential After You Earn It
- Frequently Asked Questions
- DACVS means Diplomate, American College of Veterinary Surgeons, and Phase I is one requirement toward it, not the credential itself.
- The 2027 Phase I exam has 125 single-best-answer questions over a seven-hour published period, with a one-hour optional break.
- The 2027 fee is USD 795; registration closes October 30, 2026, and payment is due January 8, 2027.
- Anatomy is the largest knowledge area: 10% for small animals and 12% for large animals.
What the DACVS Credential Actually Is
DACVS stands for Diplomate, American College of Veterinary Surgeons. The credential is awarded by the American College of Veterinary Surgeons (ACVS) to veterinarians who complete an approved surgical residency and satisfy the College's examination and credentialing requirements. A Diplomate is recognized as a board-certified veterinary surgeon, in either small animal surgery or large animal surgery.
This article focuses on the part of the pathway that most candidates think about first: the Phase I Surgical Knowledge Examination. If you want shorter definitional pages on the acronym itself, see our explainers on what DACVS stands for, the meaning of DACVS, and what a DACVS is. The overview of DACVS certification gives the broader picture.
Where Phase I Fits in the Pathway
The route to DACVS is a multi-year training pathway, and the examination sits inside it rather than at the end of it. Understanding the sequence prevents the most common misreading of the credential.
- Veterinary qualification and internship. Entry to the training pathway requires a veterinary degree plus a twelve-month rotating internship or equivalent experience.
- Approved residency. Full certification requires completion of at least a three-year, 156-week approved residency, including 110 weeks of surgical training.
- Scientific publication. An accepted scientific publication is part of the full-credential requirements.
- Credentials approval. Your training record is reviewed and approved.
- Phase I and Phase II. Both examinations must be passed for the Diplomate credential.
Importantly, the full-credential completion requirements above are not prerequisites for sitting Phase I during residency. Residents may sit Phase I at any time during residency, optimally in the second year, and must pass within six years of starting residency. For a detailed walk-through of the prerequisites, see our guide to DACVS requirements, and for the training side specifically, our page on DACVS training.
Who Can Sit for Phase I
Phase I is not an open-enrollment exam. Eligibility is tied to your standing in an ACVS residency, and the application process runs through the College's online system (CERT). To register, you need:
- Status as an ACVS resident in good standing, without applicable probation or sanctions.
- An attestation from your adviser.
- Your own attestation of training and study readiness, completed in CERT.
The adviser attestation matters in practice. It means your program has a say in whether you are ready, and it gives you a natural checkpoint to discuss timing. Many residents and advisers aim for the second year, but the published guidance allows flexibility within the six-year window from the start of residency.
Exam Format and Test-Day Rules
The Phase I exam is computer-based and delivered at Pearson VUE/Pearson Professional Assessments centers, coordinated through HumRRO. The format is unusual enough that it deserves attention before you start practicing.
| Feature | 2027 Phase I Detail |
|---|---|
| Question count | 125 single-best-answer multiple-choice questions |
| Unscored items | Approximately ten pilot questions, mixed in |
| Published examination period | Seven hours, divided into two equal-time parts |
| Scheduled break | Optional, up to one hour; the test clock stops |
| Review within a part | Permitted |
| Return to Part 1 after the break | Not permitted |
| Unscheduled breaks | The clock continues running |
| Animal form | Small animal or large animal |
Rules That Affect Your Strategy
Information aids, books, notes and phones are prohibited. During breaks you remain at the test center and cannot access your phone, notes or study materials. Laminated note paper is provided. Because you cannot return to the first part once the break begins, you should finish your review of Part 1 before you take the scheduled break. Treat that boundary as a hard deadline in your pacing plan.
Since approximately ten of the 125 questions are unscored pilot items, you cannot tell which ones they are. Answer every question as though it counts, and do not let an unfamiliar or oddly worded item derail you; it may be a pilot.
The Four Official Examination Disciplines
The formal ACVS Phase I Examination Blueprint, effective April 2026 for the 2027 examination after the 2024-2025 Job Task Analysis, organizes content into four main disciplines. These are official examination disciplines, not preparation-curriculum headings, so use them to understand what is tested rather than as a ready-made study plan.
Domain 1: Basic Science
The broadest discipline, covering the foundational knowledge behind surgical practice. Knowledge areas include Anatomy, Physiology, Pathobiology, Microbiology, and Biomechanics (Biomechanics and Locomotion on the small-animal form).
- Systems covered: Gastrointestinal, Cardiovascular, Respiratory, Urogenital, Musculoskeletal, Neurological/Special Senses, Integumentary, Endocrine (Small Animal only), and Non-System Specific.
- Anatomy is the single largest knowledge area on both forms.
Domain 2: Pharmacology
Drug and fluid knowledge relevant to the surgical patient, including Antimicrobials, Fluid Therapy, Biological Therapy, and Other Drugs.
- Small animal adds Cardiovascular/Autonomic Drugs.
- Large animal adds Anti-Inflammatory Drugs and Intrasynovial Therapy.
Domain 3: Principles of Anesthesia/Analgesia and Pain Management
Covers Anesthetic Equipment, General Anesthesia, Local Anesthesia, Analgesics, Anesthetic Drugs, and Inflammatory Modulation.
- General Anesthesia carries 6% on the small-animal form versus 3% on the large-animal form.
Domain 4: Surgical Methods
The applied core: Tissue Handling/Hemostasis, Aseptic Techniques, Wound/Tissue Healing, Instrumentation and Implants, and Fundamentals and Principles of Surgery.
- Phase I tests surgical fundamentals, not clinical diseases and their specific treatment, per the current Examination FAQ.
A deeper treatment of each area is available in our complete guide to the DACVS exam domains.
Species Coverage
The two forms differ in the species they draw on. Small Animal covers domestic canine, feline and non-species-specific content. Large Animal covers equine, food animal, small ruminant, camelid and non-species-specific content. Choose the form that matches your residency track, and prepare against that form's weights rather than the other's.
Knowledge-Area Weights by Animal Form
The blueprint prints approximate knowledge-area weights separately for each animal form. It does not publish aggregate percentages for the four main disciplines, so any "Basic Science is X% of the exam" figure you see elsewhere is not from the blueprint. The small-animal entries total 98% as printed and the large-animal entries total 100%; neither set should be normalized.
| Knowledge Area | Small Animal | Large Animal |
|---|---|---|
| Anatomy | 10% | 12% |
| Physiology | 9% | 10% |
| Pathobiology | 9% | 9% |
| Microbiology | 2% | 3% |
| Biomechanics (and Locomotion) | 4% | 2% |
| Antimicrobials | 3% | 4% |
| C-V/Autonomic Drugs | 2% | Not listed |
| Anti-Inflammatory Drugs | Not listed | 3% |
| Fluid Therapy | 3% | 3% |
| Biological Therapy | 1% | 2% |
| Intrasynovial Therapy | Not listed | 3% |
| Other Drugs | 2% | 3% |
| Anesthetic Equipment | 3% | 2% |
| General Anesthesia | 6% | 3% |
| Local Anesthesia | 3% | 3% |
| Analgesics | 5% | 3% |
| Anesthetic Drugs | 3% | 3% |
| Inflammatory Modulation | 1% | 2% |
| Tissue Handling/Hemostasis | 8% | 7% |
| Aseptic Techniques | 6% | 5% |
| Wound/Tissue Healing | 6% | 7% |
| Instrumentation Implants | 6% | 7% |
| Fundamentals and Principles of Surgery | 6% | 4% |
Key Takeaway
Read the blueprint for your own form. Small-animal candidates should give extra weight to General Anesthesia (6%) and Analgesics (5%), while large-animal candidates face heavier Anatomy (12%) and unique Intrasynovial Therapy content (3%). Weights are approximate, so use them to prioritize, not to skip topics.
2027 Registration, Fees and Dates
Logistics for the 2027 sitting come from the 2027 Phase I Surgical Knowledge Examination Information Pamphlet (September 2026). Key figures:
| Item | 2027 Detail |
|---|---|
| Examination fee | USD 795 |
| Registration window | September 16 - October 30, 2026 |
| Payment due | January 8, 2027 |
| Exam date (Americas and Europe) | April 19, 2027 |
| Exam date (Asia and Oceania) | April 20, 2027 |
| Delivery | Pearson VUE/Pearson Professional Assessments centers |
| Results | Ordinarily released in four to six weeks |
Note the gap between registration and payment: you register in the autumn window, but payment is not due until January. Missing the registration close on October 30 is the avoidable error, so calendar it well ahead. For scheduling context across the cycle, see our page on DACVS exam dates, and for the full financial picture beyond the exam fee, the DACVS certification cost breakdown.
How Phase I Is Scored
The passing standard is criterion-referenced. It is set by experts and equated across years, which means it reflects a defined competence standard rather than a curve against the current cohort. It also cannot be raised after the examination, so a strong cohort does not make the bar harder for you.
Two things are worth being candid about. First, no fixed numerical pass mark was verified, so beware of any source quoting a specific cut score. Second, no current issuer-wide Phase I pass rate was verified. The published 2017-2021 small-animal residency-program survey exists, but it is historical research rather than a current issuer-wide cohort rate, and it should not be quoted as today's pass rate. Our pages on the DACVS passing score and the DACVS pass rate explain what can and cannot be said responsibly.
Sequencing Your Preparation Around the Blueprint
Because Phase I tests fundamentals rather than clinical disease management, your reading should lean on the ACVS Phase I Examination Reading List, which is unchanged from 2026 to 2027, and on the Examination FAQ. Do not substitute the Phase II journal-review or specific surgical-procedure requirements for your Phase I outline; they are a different examination with a different purpose.
One sensible way to sequence the work, anchored to the weights above, is shown below. Adjust it to your form and your timeline.
Anatomy and Physiology First
- Anatomy is the largest knowledge area (10% small animal, 12% large animal), so front-load it while you have the most time.
- Pair with Physiology (9% and 10%) to reinforce structure with function.
Pathobiology, Microbiology and Biomechanics
- Pathobiology is 9% on both forms.
- Biomechanics is heavier for small animals (4%, with Locomotion) than large animals (2%).
Pharmacology and Anesthesia
- Antimicrobials, Fluid Therapy and form-specific drug topics.
- Small animal: emphasize General Anesthesia and Analgesics. Large animal: add Intrasynovial Therapy.
Surgical Methods and Timed Practice
- Tissue Handling/Hemostasis, Aseptic Techniques, Wound/Tissue Healing, Instrumentation and Implants.
- Run timed blocks against the two-part, no-return-after-break structure.
For a fuller approach, our DACVS study guide expands this, and the DACVS cheat sheet is useful for last-week review. When you are ready to test yourself under realistic conditions, try the practice questions on our DACVS practice test site.
Keeping the Credential After You Earn It
Certification is not a one-time event. Maintenance applies to the full Diplomate credential after completion of certification. For Diplomates certified in 2016 or later, the initial certificate expires on the sixth December 31 after the examination, and subsequent cycles last five years.
Maintenance of Certification (MOC) requires:
- 100 qualifying activity points, including at least 70 within your certified animal specialty (small animal surgery or large animal surgery).
- Continued good standing.
- Submission through CERT by November 1 of the expiry year.
The current MOC page specifies no submission fee. Details are in the ACVS Diplomate Maintenance of Certification Policies and Procedures (September 2024). Because the 70-point specialty requirement ties directly to your certified animal form, the choice you make at the Phase I stage shapes your continuing-education profile for the rest of your career.
Career Value and Where Diplomates Work
Board certification in surgery is widely associated with referral and specialty practice, academic and teaching hospitals, and other settings where advanced surgical expertise is expected. We do not quote earnings figures here because none are published in the certification materials; for a qualitative discussion, see our DACVS salary guide, the DACVS jobs overview, and our analysis of whether DACVS certification is worth it.
Frequently Asked Questions
No. Phase I is one requirement toward the credential. Full Diplomate status also requires completing an approved residency of at least three years (156 weeks, including 110 weeks of surgical training), an accepted scientific publication, approved credentials, and Phase II.
There are 125 single-best-answer multiple-choice questions, including approximately ten unscored pilot questions. The published examination period is seven hours, split into two equal-time parts with an optional break of up to one hour during which the clock stops.
Residents may sit at any time during residency, optimally in the second year, and must pass within six years of starting residency. You must be an ACVS resident in good standing with an adviser attestation and your own readiness attestation in CERT.
No. Phase I addresses surgical fundamentals and basic science. The current Examination FAQ excludes clinical diseases and their specific treatment. Phase II journal-review and procedure-specific requirements should not be used as a Phase I outline.
The 2027 fee is USD 795. Registration runs September 16 to October 30, 2026, and payment is due January 8, 2027. The exam is scheduled April 19, 2027 in the Americas and Europe and April 20 in Asia and Oceania.