- Certification in Allergy & Immunology is issued by the American Board of Allergy and Immunology (ABAI).
- The 2026 initial exam is 225 multiple-choice questions across two sessions over seven hours.
- Allergy and Hypersensitivity Principles and Disorders carries the heaviest blueprint weight at 54%.
- Eligibility requires ABIM and/or ABP certification plus 24 consecutive months of fellowship training.
What the Letters Actually Stand For
When candidates search "what does Allergy & Immunology stand for," they're usually asking about the physician credential that verifies subspecialty competence in treating allergic, immunologic, and hypersensitivity conditions. In this context, Allergy & Immunology refers specifically to the initial certification examination administered by the American Board of Allergy and Immunology (ABAI). It is not a training program name, a hospital department title, or a different professional designation that happens to share the same abbreviation - it is a defined, board-governed physician certification with its own exam blueprint, fee schedule, and eligibility rules.
This distinction matters because "A&I" and similar shorthand appear across multiple unrelated credentials in medicine and other fields. If you land on this page, assume every fact discussed here applies only to the ABAI-administered certification described in official ABAI documentation - not to any other credential that happens to share the acronym.
Who Issues This Certification
The American Board of Allergy and Immunology is the sole certifying body for this credential. ABAI coordinates delivery of the initial certification exam through Pearson VUE test centers, with logistics handled in partnership with Data Recognition Corporation (DRC). This is a computer-based, proctored, in-person testing model rather than a remote or open-book format for the initial exam.
Because ABAI is the only body that grants this specific certification, every fact about fees, dates, and content weighting traces back to ABAI's own published materials. If you're comparing information across sites, verify it against ABAI's official pages rather than assuming another "Allergy & Immunology" credential's numbers apply here.
Why This Isn't the Other "A&I" You've Heard Of
Because the acronym is reused across different certifying organizations, it's easy to accidentally mix up fee structures, exam lengths, or domain weightings that belong to an entirely different program. This article - and the rest of this site - sticks strictly to ABAI's Certification in Allergy & Immunology. For a broader orientation to the credential's identity and scope, see What Is Allergy & Immunology? and Allergy & Immunology Meaning, which unpack the terminology in more depth without borrowing from unrelated certifications.
How the Exam Is Built and Delivered
The initial certification exam consists of 225 multiple-choice questions delivered across two sessions totaling seven hours. This is a long, endurance-testing format, and candidates should plan their preparation and test-day pacing accordingly rather than treating it like a shorter subspecialty exam.
Passing is determined against an absolute minimum standard - ABAI does not publish a simple percentage-correct cutoff. This means the passing bar is set independently of any single administration's difficulty, which has real implications for how you should interpret practice-test scores while preparing. For a deeper breakdown of what this standard means in practice, see Allergy & Immunology Passing Score 2026: Exactly What You Need to Pass.
The Three Content Domains Behind the Name
Understanding what the certification "stands for" also means understanding what it actually tests. ABAI's blueprint, last updated in November 2021, organizes content into three top-level categories that together define the full scope of the exam.
Domain 1: Allergy and Hypersensitivity Principles and Disorders (54%)
The largest domain by far, covering the mechanisms and clinical management of allergic and hypersensitivity conditions. This includes food and drug allergy/hypersensitivity reactions - though notably, eosinophilic gastrointestinal disease is classified separately under the Eosinophilic and Gastrointestinal Disorders subdomain, not here.
- Immunodeficiencies is the single largest named subdomain across the entire exam at 16%.
Domain 2: Immunological Disorders (45%)
Covers immune-mediated disease outside the strict allergy/hypersensitivity umbrella, requiring deep familiarity with immunodeficiency states, autoimmune mechanisms, and related diagnostic reasoning.
Domain 3: Emerging Health Priorities (1%)
A small but present slice of the blueprint covering newer or evolving clinical priorities in the field. Its low weight means it should receive proportionally light study time relative to the other two domains.
ABAI also publishes a cross-cutting classification of roughly 25% Basic Science versus 75% Clinical Science. This is not a fourth domain or an alternative content list - it's a lens applied across the same three domains above, distinguishing foundational science questions from clinically applied ones. For a complete walkthrough of every subdomain and how the weights interact, see Allergy & Immunology Exam Domains 2026: Complete Guide to All 3 Content Areas.
Key Takeaway
Because Allergy and Hypersensitivity Principles and Disorders carries 54% of the blueprint, it deserves the largest share of your study calendar - but don't neglect Immunological Disorders at 45%, since together they account for 99% of scored content.
Who Can Sit for It
The name "Allergy & Immunology" certification implies a specific eligibility path, not an open-enrollment exam. To qualify, candidates need:
- ABIM and/or ABP certification current as of the examination date
- At least 24 consecutive months of full-time qualifying allergy/immunology fellowship training
- Valid, current, unrestricted medical licensure
This eligibility structure reflects that the credential sits atop prior internal medicine or pediatrics board certification - it's a subspecialty layer, not a standalone entry point into practice. Full detail on documentation and edge cases lives in Allergy & Immunology Requirements 2026: Eligibility, Prerequisites & How to Qualify.
What Happens After You Pass
A new certificate carries a ten-year term. During that decade, diplomates must satisfy Maintenance of Certification (MOC) requirements, which are distinct from the initial exam and include:
- Annual license attestation
- 25 relevant AMA PRA Category I CME credits every year
- A patient-safety module once every ten years
- A practice-assessment/quality-improvement module once every five years
- Continuous Assessment Program (CAP) participation, plus a $400 annual fee
CAP itself is open-resource and delivered as 80 questions annually across two blocks, at ten minutes per question, with passing determined by an aggregate 80% across a five-year cycle after the two lowest-scoring blocks are dropped. These are renewal-phase rules and should not be confused with the initial certification exam's format or standard - a distinction that trips up many candidates researching the credential for the first time.
Turning the Name Into a Study Plan
Once you understand what the certification stands for structurally - three domains, a fixed 225-question format, an absolute passing standard, and a decade-long renewal cycle - the next step is converting that structure into a preparation schedule. Because Allergy and Hypersensitivity Principles and Disorders and Immunological Disorders together make up 99% of the blueprint, most study blocks should rotate between these two, with only brief attention to Emerging Health Priorities near the end of preparation.
Allergy and Hypersensitivity Principles and Disorders
- Build depth here first since it carries 54% of the blueprint
- Separate food/drug hypersensitivity content from eosinophilic GI disease, which belongs elsewhere
Immunological Disorders
- Prioritize immunodeficiencies, the largest single named subdomain at 16%
- Cross-reference clinical versus basic-science framing as you review
Integration and Emerging Health Priorities
- Mixed practice sessions replicating the two-session, seven-hour format
- Light review of Emerging Health Priorities given its 1% weight
For a full first-attempt strategy that maps study techniques directly onto blueprint weighting, see Allergy & Immunology Study Guide 2026: How to Pass on Your First Attempt. If you're still gauging the overall challenge level before committing to a timeline, How Hard Is the Allergy & Immunology Exam? Complete Difficulty Guide 2026 and Allergy & Immunology Pass Rate 2026: What the Data Shows provide useful context. You can also build familiarity with the two-session, timed format using realistic practice questions on our practice test platform before exam day.
Frequently Asked Questions
It refers to the initial physician certification examination administered by the American Board of Allergy and Immunology (ABAI), verifying subspecialty competence in allergic and immunologic disease - distinct from the fellows' In-Training Examination and from later Maintenance of Certification assessments.
No. This site covers only ABAI's Certification in Allergy & Immunology. Other organizations may use similar abbreviations for unrelated credentials with different fees, formats, and requirements.
The exam contains 225 multiple-choice questions delivered across two sessions, totaling seven hours of testing time.
Allergy and Hypersensitivity Principles and Disorders carries the largest blueprint weight at 54%, followed by Immunological Disorders at 45%. Emerging Health Priorities makes up just 1%.
New certificates are valid for a ten-year term, after which Maintenance of Certification requirements, including CAP participation and annual fees, apply.
Understanding exactly what this certification stands for - its issuing body, exact format, blueprint weighting, and renewal structure - is the foundation for every other decision in your preparation. For related terminology breakdowns, see What Does Allergy & Immunology Mean? and Allergy & Immunology Certification.