- What "REI Requirements" Actually Means
- The Training Pathway Before You Sit for Anything
- The Two-Stage ABOG Process: QE and CE
- The 2026 Thesis Change for Fellowship Graduates
- What the Blueprint Expects You to Know
- Registration, Delivery, and Dates: What Is and Is Not Established
- Staying Certified After You Pass
- A Qualification Timeline Mapped to Your Training Years
- Frequently Asked Questions
- REI is the American Board of Obstetrics and Gynecology (ABOG) subspecialty credential in Reproductive Endocrinology & Infertility, built on OB/GYN...
- Certification has two distinct stages: a written Qualifying Examination (QE) and an oral Certifying Examination (CE).
- For fellowship graduates from 2026 onward, the thesis moves from CE eligibility to QE eligibility; earlier graduates keep prior requirements.
- The ABOG REI blueprint lists six primary categories and 27 subcategories, with no published percentage weights.
What "REI Requirements" Actually Means
When physicians search for REI requirements, they are asking a specific question: what must I complete to become board certified in Reproductive Endocrinology & Infertility? This is a subspecialty credential issued by the American Board of Obstetrics and Gynecology (ABOG). It is not an entry-level certificate, and it is not something you can reach without completing a long, structured training sequence first.
If you are still orienting yourself to the field, our explainers on what REI is and what REI certification involves cover the basics. This article focuses on the qualification side: the prerequisites, the exam stages, and the recent change affecting 2026 fellowship graduates.
The Training Pathway Before You Sit for Anything
The training context for the REI subspecialty is described in the ASRM 2025 scope-of-practice statement on the definition, training, and scope of practice of the REI subspecialist in the United States. It is a professional-society summary rather than an ABOG exam blueprint, but it lays out the sequence clearly: medical school, a four-year obstetrics and gynecology residency, and a three-year REI fellowship.
| Stage | What It Involves | Why It Matters for Eligibility |
|---|---|---|
| Medical school | Completion of an MD or equivalent medical degree | Foundation for entering OB/GYN residency |
| OB/GYN residency | Four years of obstetrics and gynecology training | The general specialty base on which the subspecialty is built |
| REI fellowship | Three years of subspecialty training in reproductive endocrinology and infertility | Subspecialty training that precedes the QE and CE |
| QE then CE | Written Qualifying Examination, then oral Certifying Examination | The two-stage board process for subspecialty certification |
That is roughly a decade of post-secondary training before certification is even on the table, which is why questions about return on that investment come up so often. If you are weighing the long road, see our analysis in Is the REI Certification Worth It? and the career-focused pages on REI jobs and REI salary.
Why the fellowship matters beyond the checkbox
The three fellowship years are where candidates build most of what the exam later tests: stimulation protocols, laboratory assay interpretation, embryology, surgical management of anatomic disorders, and the genetics of reproductive disease. Because the board blueprint spans basic science, clinical endocrinology, ART, and genetics, fellowship exposure to each area directly shapes how prepared you are for the written stage.
The Two-Stage ABOG Process: QE and CE
REI certification through ABOG retains two separate examinations. This is a point worth stating plainly because the credential is sometimes loosely described as a single "REI exam."
- Qualifying Examination (QE): the written examination, delivered through Pearson VUE.
- Certifying Examination (CE): the oral examination.
The two stages are distinct. The credential is not renamed to either stage, and it is not the same thing as certification through the American Osteopathic Board of Obstetrics and Gynecology. If you are looking at ABOG certification, you are looking at the pathway described here.
For a sense of how demanding each stage is, see How Hard Is the REI Exam?. For outcome data, REI Pass Rate 2026 reviews what has been published.
The 2026 Thesis Change for Fellowship Graduates
The most consequential recent update to REI requirements concerns the thesis. According to the issuer-authored ABOG update presented at the 2026 SMFM Program Directors Meeting, the thesis moves from CE eligibility to QE eligibility for fellowship graduates from 2026 onward.
In practical terms:
- Fellowship graduates from 2026 onward: the thesis requirement attaches to eligibility for the written QE rather than the oral CE.
- Earlier graduates: they retain their prior requirements, meaning the previous thesis-timing rules continue to apply to them.
Key Takeaway
Check your graduation year first. If you finished fellowship in 2026 or later, plan your research and thesis timeline so it is complete before you can sit for the written QE. If you graduated earlier, confirm with ABOG that your prior requirements still govern your file.
Fellows and program directors should treat the thesis as a scheduling constraint, not an afterthought. Because the requirement now gates the first exam stage for newer graduates, delays in finishing it can delay the entire certification sequence.
What the Blueprint Expects You to Know
Eligibility gets you to the exam; the blueprint tells you what the exam covers. The current ABOG REI blueprint, retrieved from the board's exam blueprints page, is a four-page document listing six primary categories and 27 subcategories. It states no percentage weights, and it does not assign separate coverage to the QE and CE. Any allocation of practice questions you see elsewhere, including on this site, is editorial rather than official. For a full walkthrough, see REI Exam Domains 2026: Complete Guide to All 6 Content Areas.
Domain 1: Foundational Reproductive Endocrinology
The basic-science layer that everything else rests on.
- Hormone structure and function
- Basic pharmacology
- Laboratory assays and how to interpret them
Domain 2: Reproductive Endocrine Function and Disease
Endocrine physiology across the lifespan and the disorders that disrupt it.
- Reproductive physiology across the lifespan
- Neuroendocrine and thyroid disorders
- Endometrial physiology and abnormal uterine bleeding
- Ovarian and adrenal disorders, both idiopathic and iatrogenic
Domain 3: Conception and Pregnancy: Physiology and Pathology
From gametes to early gestation.
- Gamete biology and early embryo development
- Endocrinology of pregnancy
- Early pregnancy and recurrent pregnancy loss
Domain 4: Fertility and Infertility
The clinical core of the subspecialty.
- Female fertility and infertility
- Male infertility
- Fertility treatment: special considerations
- Assisted reproductive technology (ART) techniques
- Fertility preservation
Domain 5: Anatomic Reproductive Disorders
Structural and surgical conditions affecting reproduction.
- Pelvic adhesive disease, endometriosis, and adenomyosis
- Congenital anomalies of the reproductive tract
- Asherman syndrome
- Leiomyomas and endometrial polyps
Domain 6: Reproductive Genetics
Genetic knowledge applied to patient care.
- Understanding of genetic testing and screening
- Application of genetic screening and testing to patient care
Because the six domains are unweighted in the official document, avoid over-investing in any single area on the strength of rumor. A balanced pass across all six, with extra attention to your weakest, is the safer plan. Our REI Study Guide 2026 and the one-page REI Cheat Sheet can help you organize that review, and you can pressure-test your recall with the REI practice tests.
Registration, Delivery, and Dates: What Is and Is Not Established
This is the section where precision matters most, because exam logistics change and are stage-specific.
| Item | What Is Established | What You Must Confirm |
|---|---|---|
| QE delivery | Written exam delivered through Pearson VUE | Current scheduling steps and testing-center options |
| CE format | Oral examination, distinct from the QE | Current format details in the applicable bulletin |
| 2026 dates (historical) | Subspecialty QE on July 20; CE April 13-17 | Your own cycle's dates; these are not booking promises |
| Fees and deadlines | Not established by the common blueprint | Current QE or CE bulletin |
The 2026 dates above come from the ABOG presentation and describe that cycle. They are historical reference points, not a promise that future windows will fall on the same days. For the scheduling picture, see REI Exam Dates 2026, and for money matters see REI Certification Cost 2026. Scoring details are covered in REI Passing Score 2026.
Key Takeaway
The common REI blueprint does not publish fee amounts, application deadlines, or stage-specific numeric logistics. Do not rely on third-party figures. The applicable current QE or CE bulletin from ABOG is the only authoritative source for those details.
Staying Certified After You Pass
Qualifying is not the end of the requirements. The ABOG presentation lists continuing-certification participation as necessary to remain certified. In other words, the credential is something you maintain through ongoing participation rather than a one-time achievement. Plan for that expectation from the moment you pass, and check the board's current continuing-certification materials for what participation entails in your situation.
A Qualification Timeline Mapped to Your Training Years
Rather than a generic study calendar, think about qualification as a sequence of milestones tied to fellowship. This is the one place where we offer a planning structure, and it is anchored to the specifics above.
Build the foundation
- Lock in Domain 1 material: hormone function, pharmacology, and assays
- Scope your thesis project so it can finish on time
- Confirm your graduation year and which thesis rule applies to you
Deepen clinical breadth
- Work through Domains 2, 3, and 4 alongside your clinical rotations
- Use case exposure to anchor ART techniques and fertility preservation
- Advance the thesis toward completion
Close gaps and prepare for the QE
- Review Domains 5 and 6, since anatomic disorders and genetics often get less hands-on time
- Finish the thesis if you are a 2026-or-later graduate, since it now affects QE eligibility
- Take timed practice questions to expose weak subcategories
Prepare for the oral CE
- Rehearse presenting clinical reasoning aloud, since the CE is oral
- Review your own case experience across all six domains
- Revisit the current CE bulletin for format specifics
The reasoning behind the ordering is simple: foundational science comes first because later domains build on it, while anatomic and genetic topics are pushed later because they tend to receive less day-to-day repetition during fellowship and are easy to underweight.
Frequently Asked Questions
The American Board of Obstetrics and Gynecology (ABOG) issues certification in Reproductive Endocrinology & Infertility. It involves a written Qualifying Examination followed by an oral Certifying Examination. For background, see What Does REI Stand For?.
The standard sequence is medical school, a four-year obstetrics and gynecology residency, and a three-year REI fellowship, as described in the ASRM 2025 scope-of-practice statement. Our overview of REI training expands on this path.
Yes. According to the ABOG update presented at the 2026 SMFM Program Directors Meeting, the thesis moves from CE eligibility to QE eligibility for fellowship graduates from 2026 onward. Earlier graduates retain their prior requirements.
The current ABOG REI blueprint lists six primary categories and 27 subcategories but does not state percentage weights or separate QE and CE allocations. Any weighting you see elsewhere is editorial, not official.
The common blueprint does not establish stage-specific numeric logistics, so use the applicable current QE or CE bulletin from ABOG. The 2026 dates mentioned here are historical, not upcoming booking promises. When you are ready to test your readiness, the REI practice exam is a good next step, and our REI certification overview ties the whole process together.