- What REI Certification Actually Is
- The Training Path Behind the Credential
- Two Stages: Written Qualifying Exam and Oral Certifying Exam
- Reading the Six-Category Blueprint
- High-Yield Topics Candidates Must Master
- Recent Changes and Published Outcomes
- Sequencing Your Preparation by Domain
- Career Value and Who Hires Certified Subspecialists
- Frequently Asked Questions
- REI certification is issued through the American Board of Obstetrics and Gynecology (ABOG) and has two parts: a written Qualifying Examination and an oral...
- The current ABOG REI blueprint lists six primary categories and 27 subcategories, with no percentage weights published.
- Fellowship graduates from 2026 onward take the thesis requirement at the QE stage rather than the CE stage.
- ABOG reported 2025 first-time pass rates of 100% on the QE (N=55) and 94.7% on the CE (N=57).
What REI Certification Actually Is
In this article, REI means Reproductive Endocrinology & Infertility, the obstetrics and gynecology subspecialty that manages hormonal disorders of reproduction, infertility, assisted reproductive technology, and related anatomic and genetic conditions. The certifying body is the American Board of Obstetrics and Gynecology (ABOG). If you are searching for a general definition first, see What Is REI Certification? and What Does REI Stand For?.
The credential is a subspecialty certification, so it sits on top of primary certification in obstetrics and gynecology. It is not a single sitting. Candidates pass a written Qualifying Examination (QE), delivered through Pearson VUE, and an oral Certifying Examination (CE). The two stages are distinct and should not be conflated in your planning. For a deeper look at prerequisites, read REI Requirements: Eligibility, Prerequisites & How to Qualify.
The Training Path Behind the Credential
The ASRM 2025 scope-of-practice statement for REI subspecialists describes the standard route: medical school, a four-year obstetrics and gynecology residency, and a three-year fellowship in reproductive endocrinology and infertility. That statement is a professional-society summary of training and scope, not an exam blueprint, so use it to understand context rather than to predict exam content.
Fellowship is where most of the exam knowledge is built. Three years of clinical work in stimulation protocols, IVF laboratory interaction, reproductive surgery, and endocrine disorders gives you the applied foundation. The exam then asks you to systematize it. If you want a broader view of what training looks like day to day, see REI Training.
Two Stages: Written Qualifying Exam and Oral Certifying Exam
The written Qualifying Examination
The QE is a computer-based written exam delivered through Pearson VUE under ABOG's arrangement. Because the common blueprint does not establish stage-specific numeric logistics, details such as question counts, seat time, and fees belong to the applicable current QE bulletin. Do not rely on third-party summaries for those numbers. For cost planning, start with REI Certification Cost: Complete Pricing Breakdown and verify every figure against the current ABOG bulletin.
The oral Certifying Examination
The CE is an oral examination. It tests how you reason aloud through clinical scenarios, defend management decisions, and handle complications. Preparing for it is a different skill from preparing for multiple-choice recall: you need to practice structured verbal answers, not just recognize the right option.
Where the thesis fits
ABOG's presentation to subspecialty program directors confirms that the thesis moves from CE eligibility to QE eligibility for fellowship graduates from 2026 onward. Earlier graduates retain their prior requirements. If you finished fellowship before 2026, confirm which rule applies to you before you plan your timeline.
Reading the Six-Category Blueprint
The current ABOG REI blueprint is a short document covering six primary categories and 27 subcategories. It prints no percentage weights and carries no formal revision date, although the URL references 2026. That means you cannot rank topics by exam weight from the blueprint alone. You can, however, use the structure to make sure no area is left uncovered. The table below maps each domain to its published subcategories.
| Domain | Published subcategories |
|---|---|
| 1. Foundational Reproductive Endocrinology | Hormone Structure and Function; Basic Pharmacology; Laboratory Assays |
| 2. Reproductive Endocrine Function and Disease | Reproductive Physiology Across the Lifespan; Neuroendocrine Disorders; Thyroid Disorders; Endometrial Physiology and Abnormal Uterine Bleeding; Ovarian and Adrenal Disorders (Idiopathic and Iatrogenic) |
| 3. Conception and Pregnancy: Physiology and Pathology | Gamete Biology; Early Embryo Development; Endocrinology of Pregnancy; Early Pregnancy; Recurrent Pregnancy Loss |
| 4. Fertility and Infertility | Female Fertility and Infertility; Male Infertility; Fertility Treatment: Special Considerations; ART Techniques; Fertility Preservation |
| 5. Anatomic Reproductive Disorders | Pelvic Adhesive Disease; Endometriosis; Adenomyosis; Congenital Anomalies of the Reproductive Tract; Asherman Syndrome; Leiomyomas; Endometrial Polyps |
| 6. Reproductive Genetics | Understanding of Genetic Testing and Screening; Application of Genetic Screening and Testing to Patient Care |
For a domain-by-domain walkthrough, see REI Exam Domains: Complete Guide to All 6 Content Areas.
High-Yield Topics Candidates Must Master
Without published weights, "high-yield" here means topics where the blueprint's subcategory structure signals depth and where clinical reasoning depends on integrating several systems. These are editorial priorities, not official weightings.
Domain 1: Foundational Reproductive Endocrinology
This domain is the language of the whole specialty. Weakness here leaks into every other domain.
- Steroid and peptide hormone structure, synthesis pathways, and receptor action
- Pharmacology of agents used in ovulation induction, suppression, and luteal support
- Laboratory assay principles, including interpretation limits and sources of error
Domain 2: Reproductive Endocrine Function and Disease
Expect scenario-driven reasoning about endocrine axes and their disorders.
- Reproductive physiology across the lifespan, from puberty through the menopausal transition
- Neuroendocrine and thyroid disorders and how they present as reproductive dysfunction
- Endometrial physiology and the evaluation of abnormal uterine bleeding
- Ovarian and adrenal disorders, both idiopathic and iatrogenic
Domain 3: Conception and Pregnancy: Physiology and Pathology
This domain links the laboratory to early gestation.
- Gamete biology and early embryo development
- Endocrinology of pregnancy and early pregnancy evaluation
- Recurrent pregnancy loss: workup logic and what the evidence does and does not support
Domain 4: Fertility and Infertility
The clinical core of the discipline, and the area where oral examiners are likely to probe your judgment.
- Female and male factor evaluation and treatment selection
- Special considerations in fertility treatment, including how patient context changes the plan
- ART techniques and the decisions that surround them
- Fertility preservation across patient populations
Domain 5: Anatomic Reproductive Disorders
Know diagnosis, effect on fertility, and when intervention helps or does not.
- Pelvic adhesive disease, endometriosis, and adenomyosis
- Congenital anomalies of the reproductive tract and Asherman syndrome
- Leiomyomas and endometrial polyps in the fertility context
Domain 6: Reproductive Genetics
Two subcategories, but conceptually broad. The blueprint separates understanding of testing and screening from applying it to patient care, so prepare for both the principle and the counseling decision.
- Genetic testing and screening concepts, including what a result can and cannot tell you
- Applying those tools to individual patients and communicating results
A compact reference for the end of your review is in the REI Cheat Sheet: One-Page Review of Must-Know Facts.
Recent Changes and Published Outcomes
Two developments matter for candidates reading about the credential today.
- Thesis timing: For fellowship graduates from 2026 onward, the thesis is tied to QE eligibility instead of CE eligibility. Earlier graduates keep their previous requirements.
- Published 2025 pass rates: ABOG's issuer presentation reports a 2025 REI first-time QE pass rate of 100% (N=55) and a CE pass rate of 94.7% (N=57). The same presentation's QE repeat and overall cohort counts are internally inconsistent, so no reconciled overall rate should be quoted.
Key Takeaway
Those first-time rates describe small cohorts of fellowship-trained candidates and do not mean the exam is easy. A small, highly selected, thoroughly trained group tends to pass at high rates. Read the numbers as reassurance about the process, not a reason to under-prepare. For more on interpretation, see REI Pass Rate: What the Data Shows and How Hard Is the REI Exam?.
For the question many candidates ask next, REI Passing Score: Exactly What You Need to Pass explains what can and cannot be said about scoring from public sources.
Sequencing Your Preparation by Domain
Because the blueprint is organized from foundations upward, a sensible order is to build the base first and then move into integrative clinical domains. The timeline below is an editorial suggestion tied to the six domains, not an official schedule. Adjust the pacing to your own fellowship strengths. A fuller plan is in the REI Study Guide: How to Pass on Your First Attempt.
Foundations first (Domain 1)
- Review hormone structure, receptor action, and synthesis pathways
- Revisit basic pharmacology and assay interpretation, since later domains assume fluency here
Endocrine disease (Domain 2)
- Work through lifespan physiology, neuroendocrine and thyroid disorders, and abnormal uterine bleeding
- Practice building differentials from lab patterns
Conception and early pregnancy (Domain 3)
- Cover gamete and embryo biology, pregnancy endocrinology, and recurrent loss
Clinical core (Domains 4 and 5)
- Spend the most time here: infertility evaluation, ART, preservation, and anatomic disorders
- Rehearse spoken management plans in preparation for the oral stage
Genetics and integration (Domain 6)
- Review testing concepts and counseling applications, then run mixed practice across all six domains
When you reach mixed practice, work through question sets that force you to switch domains mid-session, since the real exam will not group topics for you. The REI practice test site is built for that kind of cross-domain drilling.
Career Value and Who Hires Certified Subspecialists
Board certification is the standard credential for practicing as a reproductive endocrinologist. Certified subspecialists typically work in academic medical centers, private fertility practices, and hospital-affiliated reproductive medicine programs, and many hold roles that combine clinical care, laboratory oversight, research, or teaching. For a sense of the job landscape, see REI Jobs.
Compensation depends heavily on practice setting and region, and this article does not quote figures. For a discussion of earnings drivers, see REI Salary Guide: Complete Earnings Analysis, and for a broader weighing of costs and benefits, Is the REI Certification Worth It?.
Frequently Asked Questions
The American Board of Obstetrics and Gynecology (ABOG) certifies the Reproductive Endocrinology & Infertility subspecialty. Certification involves a written Qualifying Examination and an oral Certifying Examination.
No. The current ABOG REI blueprint lists six primary categories and 27 subcategories but publishes no percentage weights and no separate allocation for the QE and CE. Any weighting you see elsewhere is an editorial estimate.
According to ABOG's presentation to subspecialty program directors, fellowship graduates from 2026 onward complete the thesis as part of QE eligibility rather than CE eligibility. Earlier graduates retain their prior requirements.
ABOG reported 2025 first-time pass rates of 100% on the QE (N=55) and 94.7% on the CE (N=57). The presentation's repeat-taker and overall counts were inconsistent, so no combined overall rate should be cited.
The ASRM 2025 scope-of-practice statement describes medical school, a four-year obstetrics and gynecology residency, and a three-year REI fellowship. For eligibility details specific to your situation, confirm with ABOG and see REI Requirements.