Cardiothoracic Surgery Cheat Sheet 2026: One-Page Review of Must-Know Facts

The Exam at a Glance

This is the one-page core of Primary Certification in Cardiothoracic Surgery, issued by the American Osteopathic Board of Surgery (AOBS) with AOA certification approval. If you only memorize one block of facts before booking your exam, make it this one.

Two cautions up front. First, the blueprint below comes from the official written-exam content outline, which is a current but undated page, so confirm it again before you finalize your study plan. Second, no AOBS cardiothoracic-specific pass rate has been verified, so be skeptical of any site that quotes one. Our own breakdown on what the data shows about the Cardiothoracic Surgery pass rate explains what can and cannot be said.

Domain Weights: Where the Points Live

The official outline lists ten content areas with percentage ranges. These ranges are published as ranges, not exact counts, so treat them as planning guides rather than guarantees of how many questions you will see in each area.

The skew is obvious. Cardiac & Cardiac Surgery alone is about half the exam, and Thoracic adds roughly another quarter. Everything else is a long tail of smaller areas, with "Other" at 6-8% being the largest of the remainder. For a deeper walk through each area, see our complete guide to all 10 Cardiothoracic Surgery content areas.

Cardiac & Cardiac Surgery: The 49-53% Block

This domain is the exam. A candidate who is excellent here and merely adequate elsewhere has a far better position than the reverse. The outline names the domain broadly, so expect the questions to span the full arc of adult cardiac surgical practice rather than a single procedure family.

The bullets above are study categories drawn from the breadth of the specialty, not an official list of tested subtopics. The outline itself does not enumerate every subtopic, which is why working practice questions against the named domain is more reliable than relying on any single textbook chapter list.

How cardiac questions tend to feel

The format is multiple choice, but the content is a surgeon's decision tree. A vignette gives you a patient, a finding and a constraint, and the correct answer is usually the next best step or the most appropriate operation rather than a pure definition. If you have been in a cardiothoracic program, the thinking pattern will feel familiar; the challenge is covering the less-frequent pathology you may not have seen in your own case log. Our difficulty guide for the Cardiothoracic Surgery exam discusses where candidates typically feel exposed.

Thoracic: The Second Pillar

At 23-27%, Thoracic is the clear second priority. Do not let the cardiac emphasis lull you into treating general thoracic surgery as a side topic; it carries nearly as much weight as every one of the eight smaller domains combined and more.

Again, these are study categories rather than an official subtopic list. Note that Esophagus, Mediastinal (Mediastinum), Pulmonary and Chest are scored as their own domains, so some material you might mentally file under "thoracic" is actually counted elsewhere in the blueprint. Read the official names carefully so you know which bucket a topic belongs to.

Small Domains That Still Cost Points

Eight domains combine to fill the remainder of the exam. Individually small, they add up, and they are where well-prepared cardiac and thoracic candidates quietly lose margin.

• Other (6-8%): The largest of the small areas. Because the label is a catch-all, expect it to reward broad surgical and perioperative knowledge rather than a single discipline.
• Pulmonary (2-6%): Physiology, pulmonary disease and ventilatory management as they intersect with surgical decisions.
• Chest (1-5%): Chest-related conditions distinct from the larger Thoracic domain.
• Esophagus (2-5%): Benign and malignant esophageal disease and operative approaches.
• Mediastinal (Mediastinum) (1-4%): Mediastinal masses and their evaluation.
• Basic Science (1-3%): Foundational anatomy, physiology and pathology that underpin the clinical domains.
• Osteopathic Manipulative Medicine (1-3%): A distinctive feature of an osteopathic board exam. Do not skip it; a small domain is still scorable.
• Trauma (1-3%): Thoracic and cardiac injury recognition and initial management.

Fees, Delivery and Registration Mechanics

Budget the exam as two separate payments. The written exam is $1,500 and the oral exam is $1,500, so the standard AOBS written-plus-oral path totals $3,000 by simple addition. That figure excludes other costs such as travel to an in-person oral sitting, study materials and any application or administrative charges. It also does not assume the same fee path for candidates who receive written-exam credit, so check your own situation before assuming $3,000 applies to you. For a fuller cost picture, see our Cardiothoracic Surgery certification cost breakdown.

Remote written delivery

When the written exam is delivered remotely, the AOA instructions name the MonitorEDU Secure Browser and PARADIGM testing. Treat the technology setup as part of your preparation: confirm the current AOA remote-proctoring instructions well ahead of your date and complete any system checks they require rather than discovering a problem on exam morning.

Application lead time and dates

Here the sources do not agree, and you should not paper over the conflict. The specialty pages conflict on five versus six months of application lead time and retain April scheduling, while the board homepage lists May 1-3, 2027 for the remote Spring Qualifying Examination. Individual deadlines must be resolved through current notices and the application portal. Our exam dates, windows and deadlines guide tracks how to approach this, and the safest planning assumption is the longer lead time.

Eligibility and the ABTS Written-Exam Credit

Eligibility requires approved training, active unrestricted licensure and required documentation. The specialty page retains the traditional description of four years of AOA-approved general surgery plus two years of cardiothoracic training, with program-director documentation. Current AOBS Board Policies also recognize qualifying DO/MD and ACGME routes. Because the specialty page and the Board Policies describe the pathway differently, read both and confirm which applies to you. Our eligibility and prerequisites guide covers this in more depth.

The Oral Stage in One Paragraph

The oral exam is criterion-referenced and built around clinical cases. Examiners assess how you work through diagnosis, investigations, differential diagnosis and management. The fee is $1,500, and the 2026 sitting was September 30 in person in New Orleans. No oral question count or timer is published in the materials reviewed, so do not assume one; prepare instead to talk through a case from first presentation to definitive management and to defend each decision. Practice presenting aloud with a colleague or mentor, because fluent written knowledge does not automatically translate into a clear verbal case presentation.

Retakes, Status and Maintenance

If you do not pass

• The written-exam page requires reapplication after a failure.
• It describes a two-year retake window after the first or second failure.
• After a third written or oral failure, documented board-review study is required before another written attempt.

Plan your first attempt as though it is your only attempt. The retake rules are workable but they cost time, money and momentum.

Staying certified

The specialty timeline describes primary active status for one year, subject to OCC (Osteopathic Continuous Certification). Maintenance elements include:

• Active licensure.
• 60 CME credits per three-year cycle, confirmed by the current CME Requirements by Specialty Board document for 2025-2027, which supersedes the older CME-guide link.
• Annual longitudinal assessment of 15 questions.
• A QI/QA attestation every three years.

One wrinkle: the QI/QA page carries legacy 10-year-cycle wording. That wording does not establish a new ten-year validity term, so do not plan around one. For the career-value side of this commitment, our ROI analysis of Cardiothoracic Surgery certification weighs the maintenance burden against the benefits.

Scheduling Your Review by Domain Weight

This is the only study-method section in this cheat sheet, and it is tied directly to the blueprint: spend time in proportion to weight, and sequence the heaviest domains first so you can revisit them.

Adjust the length to your calendar and experience; the point is the ordering and proportion, not the specific number of weeks. For a fuller methodology, see our Cardiothoracic Surgery study guide, and when you are ready to test yourself under realistic conditions, use the Cardiothoracic Surgery practice tests.

What This Cheat Sheet Cannot Tell You

A responsible one-pager flags its own limits. Several items remain open and should be verified at the source rather than taken from any summary, including this one.

• Protocol for Certification: It is under revision, and a current handbook was not retrieved. Check the AOBS documents page for the latest version.
• Deadlines: The conflict between five and six months of lead time, and between April scheduling and the May 1-3, 2027 remote Spring Qualifying Examination listing, must be resolved through current notices and the portal.
• Pass rate: No AOBS cardiothoracic-specific pass rate was verified, so none is given here.
• Blueprint currency: The content outline page is undated. Confirm it before locking in your plan.

For passing-score mechanics beyond the scaled 500 on a 200-800 scale, see our passing score explainer, and for a quick sanity check on your readiness, try the questions at the main practice test site.

Frequently Asked Questions