Vascular Surgery Exam Domains 2026: Complete Guide to All 26 Content Areas

What the 26 Domain Lines Actually Represent

Primary Certification in Vascular Surgery is administered by the American Osteopathic Board of Surgery (AOBS), with certification approved through the American Osteopathic Association (AOA). Current issuer pages label the credential General Vascular Surgery. The written exam content outline lists 26 headings, each with a published percentage range. Those lines are the board's official content headings, and understanding what they are (and are not) will save you from misreading your own study plan.

Three points about the outline matter before you go domain by domain:

• They are ranges, not fixed weights. A heading listed at 4-6% does not mean exactly 5% of your questions. The board publishes a band, and this guide does not invent midpoints or normalize the ranges into a neat 100%.
• They are not an exhaustive blueprint. The outline describes the written component only. The oral clinical-case examination assesses diagnostic interpretation, management and judgment, and it is not mapped heading by heading in the same way.
• The outline carries no explicit revision year. The AOBS page we reviewed is undated, so always confirm against the current board page before finalizing your plan.

For a broader plan that connects these domains to a calendar, see our Vascular Surgery Study Guide 2026: How to Pass on Your First Attempt. This article stays focused on the content map itself.

Written Exam Format and the Oral Stage

The written component

The AOBS written exam consists of 200 multiple-choice questions delivered over 4 hours 30 minutes. The board does not specify how many items are scored versus unscored, so do not assume every question counts or that any question is a throwaway. The passing standard is a scaled score of 500 on a 200-800 scale. That is not a percent-correct mark, and it should not be converted into a "you need X right" estimate. Our Vascular Surgery Passing Score 2026 guide covers how to think about scaled scoring.

The written exam is remotely proctored through the MonitorEDU Secure Browser. You need a private room, a computer and a mobile device, a matching government photo ID and your AOA candidate ID. The AOA recommends a personal computer with administrator access, and online lab values, a scratch pad and a calculator are supplied. Open-book permission and adaptive delivery were not verified for the initial written examination, so do not plan around either.

The oral clinical-case exam

Full primary certification also requires an oral examination built around clinical cases. It assesses diagnostic interpretation, management and judgment, and its passing standard is criterion referenced. The reviewed oral page publishes no numeric cutoff, total case count or duration. The oral page also carries a dated September 30, 2026 notice for in-person testing in New Orleans and states that there are no virtual oral examinations in 2026. Candidates should expect to be examined without notes or books in the examination room and without electronic devices, per the AOBS in-person rules of conduct.

Practically, this means the written domains are your knowledge base, and the oral exam asks you to apply that knowledge under questioning. A domain you can only recognize but not reason through will cost you in the oral room even if it was enough for the written test.

The Heaviest Published Ranges

Note that Carotid (Domain 7, 1-3%) is listed separately from Cerebrovascular. Do not assume carotid content lives only under its own small heading; expect significant carotid-related reasoning to surface under the larger cerebrovascular range.

Mid-Range Domains: Endovascular, Trauma, Venous, Lower Extremity

Below the top two, a cluster of headings carries meaningful but more moderate ranges. These are where many candidates under-invest because no single one looks dominant.

If you are wondering how difficult a heading mix like this is in practice, our How Hard Is the Vascular Surgery Exam? article discusses what makes the breadth challenging.

Overlapping Headings: Reading the Outline Carefully

The published outline contains headings that overlap in subject matter. The board lists them separately, and this guide keeps them separate rather than merging them, but you should be aware of the overlap when studying.

• Dialysis appears twice. Domain 11 is Diagnostics (incl. Doppler), Pharmacology, Dialysis (1-5%), and Domain 12 is Dialysis (1-4%). Dialysis access planning, maintenance and complications therefore can surface under more than one heading.
• Extra-Anatomic appears twice. It is part of Domain 6 (Basic Science, Anatomy/Physiology, Extra-Anatomic) and also stands alone as Domain 14 (1-3%).
• Non-ASVD appears twice. It is part of the combined Domain 2 and also stands alone as Domain 19 (1-5%).
• Pharmacology appears twice. It is part of Domain 11 and also stands alone as Domain 20 (1-3%).
• Arterial and ASVD are separate small headings. Domain 4 (Arterial, 1-3%) and Domain 5 (ASVD, 1-3%) sit alongside the much larger Domain 2.

The Small-Range Domains Worth Not Ignoring

Many headings carry published ranges of only 1-5%. Individually modest, together they make up a large portion of the exam. Candidates who study only the big headings often lose points here.

Aorta and Thoracic

Aorta (Domain 3, 2-6%) and Thoracic (Domain 23, 2-6%) share territory with the large aneurysm heading. Study them together: thoracic and aortic pathology, repair strategies, and the complications that follow major aortic intervention.

Hematology and Pharmacology

Hematology (Domain 16, 2-6%) is a higher-range small domain and is easy to underestimate. Coagulation, thrombophilia, anticoagulant management and heparin-related complications connect directly to thrombosis and venous questions. Pharmacology (Domain 20, 1-3%) and the pharmacology portion of Domain 11 reward knowing agents, mechanisms and reversal strategies.

Visceral, Renal and Portal

Visceral (Domain 26, 1-5%), Renal (Domain 22, 1-5%) and Portal (Domain 21, 1-5%) cover mesenteric ischemia, renovascular disease and portal-system topics. These are lower-frequency subjects, but they are classic oral-case material because the diagnostic reasoning is distinctive.

Amputation, Graft, Complication, Critical Care and Lymphatic

Amputation (Domain 1, 1-4%), Graft (Domain 15, 1-5%), Complication (Domain 9, 1-3%), Critical Care (Domain 10, 1-5%) and Lymphatic (Domain 18, 1-4%) round out the outline. Graft surveillance and failure, amputation level selection, perioperative complications and critical care physiology all tie back to the larger arterial and endovascular headings, so reviewing them alongside those domains is efficient.

Domain Ranges at a Glance

The table below reproduces the published ranges for quick reference. Remember that these are the board's content headings and percentage ranges, not fixed weights.

For a one-page condensed version of the highest-yield facts across these headings, see the Vascular Surgery Cheat Sheet 2026.

Sequencing Your Review Around the Ranges

You do not need an elaborate methodology to use this outline well. A simple domain-driven order, tied to how the headings relate to each other, works better than studying alphabetically or in the order a textbook presents topics.

Whatever sequence you choose, end with mixed-domain practice. The real exam does not announce which heading a question belongs to, and the oral exam will move between topics within a single case. Realistic mixed practice is available on our Vascular Surgery practice test site. Note that the AOA's PARADIGM platform offers generic practice only, not a specialty-specific practice examination.

Eligibility, Fees and Scheduling Context

Knowing the domains is only useful if you are positioned to sit the exam. Several logistical details affect planning.

Prerequisites

The specialty written page describes five years of AOA-approved General Surgery training plus two years of AOA-approved General Vascular Surgery training, success on the RPVI examination, and an application with fees. Applicants within 90 days of completing training need a program-director letter, and documents must be approved at least 14 days before testing. The oral stage requires program completion and board approval. Common AOBS board policies also address COCA and LCME graduates and require an unrestricted active U.S. medical license, but they do not establish a specific integrated vascular alternative to the specialty page's training language. Ordinary board eligibility ends December 31 of the sixth year following training. Full detail is in our Vascular Surgery Requirements 2026 guide.

The AOA also announced on April 29, 2026 that a pass on the ABS Written Vascular Surgery Qualifying Exam (VSQE) satisfies the written requirement for AOBS oral application, with the remaining AOBS requirements still applying. That is an alternate entry route and does not replace the AOBS written blueprint discussed here.

Fees

Base AOBS examination fees are $1,500 for the written exam and $1,500 for the oral exam, totaling $3,000 for the usual two-exam route. No member or nonmember tier is published. Travel, review products and any late charges are additional. Written and oral pages describe a $500 deduction for timely cancellation, no later refund, and one board-approved transfer for extenuating circumstances to the next administration. A $200 rescore/audit can be requested within one month of results, but it does not provide access to individual items or reconsider the passing cutoff. Our Vascular Surgery Certification Cost 2026 article breaks down the full spending picture.

Scheduling

Sources conflict slightly on timing. The generic timeline says annual written testing in May, while the written page says April. The board homepage currently lists the next Spring Qualifying Examination on May 1-3, 2027 and the oral examination on October 20, 2027 in Orlando. Because these details shift, treat the current administration-specific notice as controlling and check our Vascular Surgery Exam Dates 2026 page for the scheduling picture.

After you pass

The exact timeline describes certification as active for one year after issue, conditional on osteopathic continuous certification (OCC), rather than an unconditional ten-year term. Ongoing requirements include annual unrestricted-license verification and ethics compliance, CME (60 credits per three-year cycle for time-limited diplomates and for non-time-limited diplomates who voluntarily participate in OCC; 120 for non-time-limited diplomates outside OCC), an annual 15-question open-book longitudinal assessment requiring 12 of 15 to pass, and at least one QI/QA attestation every three years. That maintenance assessment is separate from the initial certification exam. If you fail an initial or second attempt, retesting must occur within two years to keep your file active, and a third written and/or oral failure triggers documented board-review-course remediation.

Frequently Asked Questions