Reproductive Endocrinology & Infertility (REI) — Specialty Profile

Subspecialty fellowship of OB/GYN.

Exploratory, not prescriptive. This profile blends hard data (pay, match rates, burnout, demographics — each sourced and dated) with generalizations and synthesized online opinion about culture and "who fits." It's here to help you get curious and go find out for yourself — not to tell you who to become. Numbers marked ⟳ verify change every year; check the linked source before you quote one. Last reviewed: 2026-07-25.

Also called: REI, fertility medicine, "the fertility doctor." A subspecialty you reach through OB/GYN, so you first match OB/GYN out of med school, finish that residency, and then compete for a separate 3-year REI fellowship. Organ system: the reproductive axis, meaning the hypothalamic-pituitary-ovarian (HPO) hormonal loop, the ovary, and the uterus.

The 30-second version

REI is the fertility subspecialty of OB/GYN, the field organized around helping people build families, mostly through IVF and reproductive hormones. REIs run ovulation induction, monitor cycles with early-morning bloodwork and ultrasound, do egg retrievals and embryo transfers, freeze eggs and embryos, and manage the endocrine conditions of reproduction: PCOS, endometriosis, premature ovarian insufficiency, recurrent pregnancy loss. The single defining career fact, and the reason most OB/GYNs come here: REI lets you largely walk away from labor-and-delivery call. No 3 a.m. deliveries, mostly outpatient, procedures that are scheduled rather than emergent. In exchange you sign up for one of the most competitive OB/GYN fellowships to get in, a long training pipeline, an emotionally heavy caseload, and a practice world increasingly shaped by cash-pay economics and private-equity money.123

Quick dashboard (details and sources below; you reach REI through OB/GYN)
How you get here Match OB/GYN from med school → finish OB/GYN residency → apply to REI fellowship
Training after med school OB/GYN residency (4) + REI fellowship (3) = 7 years
Total from college start ~15 years (4 undergrad + 4 med school + 4 OB/GYN + 3 REI)
Competitiveness (as an OB/GYN fellowship) Among the most competitive OB/GYN fellowships — tiny field, strong self-selected pool ⟳
Typical full-time pay ~$570,000–$725,000 total comp; wide spread ⟳
Pay range (structure) Academic floor ~$300k · median ~$500k–$600k · strong private/PE ~$700k–$800k · owner ceiling $1M+ ⟳
Lifestyle Mostly outpatient, scheduled procedures, no L&D call — but early mornings and 364-day clinics
Burnout Lower than parent OB/GYN — shedding L&D call is protective ⟳
% women 80.4% of REI fellows (parent OB/GYN: 88.2% of residents, 64.1% practicing) ⟳
DO / IMG accessibility Low. Across the 2022–2026 appointment years US MDs took 84–95% of positions offered, and DO plus IMG entry ran 2–8 spots a year out of 48–59 ⟳

What they actually do

REIs are OB/GYNs who subspecialize in reproduction and reproductive hormones. The bulk of the work is assisted reproductive technology (ART), most visibly in-vitro fertilization (IVF): stimulating the ovaries with hormones, tracking the response through serial early-morning bloodwork and transvaginal ultrasound ("cycle monitoring"), retrieving eggs under sedation, fertilizing them in the embryology lab, and transferring an embryo back. Around that core sit intrauterine insemination (IUI), egg and embryo freezing, donor-egg and donor-sperm work, and preimplantation genetic testing. The other half of the field is reproductive endocrinology proper: diagnosing and treating PCOS, endometriosis, premature ovarian insufficiency, recurrent miscarriage, and the hormonal disorders that sit upstream of fertility.23

The work blends three things few specialties combine: true reproductive science (the HPO axis, gamete and embryo biology, and the fellowship even requires a research thesis), a surgical/procedural skill set (retrievals, transfers, hysteroscopy, some laparoscopy), and long, hope-driven relationships with patients who often arrive after years of trying. It is mostly outpatient and ambulatory, with little to no inpatient work.123

Representative procedures: transvaginal ultrasound-guided egg retrieval · embryo transfer · intrauterine insemination (IUI) · controlled ovarian stimulation / ovulation induction · hysteroscopy and operative hysteroscopy · diagnostic and operative laparoscopy (e.g., for endometriosis) · saline sonohysterography · egg/embryo cryopreservation and thaw cycles.23

A day in the life: It starts early, because cycle monitoring is a morning ritual, moving dozens of stimulating patients through bloodwork and ultrasound in a compressed couple of hours so their medication doses can be adjusted same-day. From there the day splits between clinic (new consults, results conversations, hormone workups) and the procedure suite (scheduled retrievals and transfers). The AMA's shadowing profile of REI Dr. Rashmi Kudesia is a useful reality check: roughly 50 hours a week, weekend call about every 4–6 weeks, and clinics that run 364 days a year. Many close only for Christmas, because ovaries don't pause for holidays. The "call" that exists is less about hospital pages and more about the inbox: patients message around the clock about failed cycles and losses, so REIs stay emotionally accessible even without an L&D pager.3

The training path & time to completion

REI is reached through OB/GYN, and there is no shortcut. You match OB/GYN out of medical school, complete the residency, and only then apply to a separate REI fellowship.14

Medical school (4 yrs) → OB/GYN residency (4 yrs) → REI fellowship (3 yrs) → board-eligible for ABOG subspecialty certification in REI.1

  • The fellowship (3 years, ACGME-accredited): at least 18 months of clinical rotations, 12 months of research (you must formulate and complete a thesis), and 6 months of electives. The research year is a real part of why the field self-selects for research-heavy applicants.1
  • Board: general OB/GYN certification through the American Board of Obstetrics & Gynecology (ABOG) is the foundation; REI subspecialty certification is also granted by ABOG (osteopathic physicians may alternatively certify through the American Osteopathic Board of OB/GYN).1
  • Total after med school: 7 years (4 OB/GYN + 3 REI). Total from the start of college: ~15 years (4 undergrad + 4 med school + 4 + 3). This is one of the longer roads in medicine, and it matters for anyone weighing time-to-attending-income.1

How competitive is it?

REI is a small field, and it is regarded as one of the most competitive OB/GYN fellowships. Commonly named alongside gynecologic oncology and maternal-fetal medicine.45 The important twist for a premed: the raw ratio doesn't look scary, but the pool is what makes it hard.

The numbers, from the NRMP fellowship Match (Specialties Matching Service) for the 2026 appointment year:4

  • 46 programs, 59 positions offered, 58 filled, a 98.3% fill rate.
  • 73 applicants for 59 positions. Roughly 1.2 applicants per position.
  • Of the 58 filled spots: US MD graduates 56 (96.6%), US DO graduates 1 (1.7%), non-US-citizen IMGs 1 (1.7%), US-citizen IMGs 0.
  • Match quality: 38.6% of applicants matched their first-choice program.

Separately, ASRM counts 52 ACGME-accredited programs producing ~68 graduates per year, a slightly different count because it tallies all accredited programs rather than only those offering a position in a given Match year.1 Either way, the entering class is tiny.

Why "1.2:1" understates the difficulty: the applicant pool is heavily pre-filtered. Applicants are typically research-strong OB/GYN residents, and weaker candidates are counseled not to apply at all, so a modest ratio hides real selectivity. Multiple analyses using a "normalized competitive index" rank REI among the most competitive OB/GYN fellowships (exact index values are behind a paywall; ⟳ verify).5 And remember: to even reach the starting line you must first match OB/GYN and excel through a 4-year residency, which is its own gauntlet.45

Compensation — the robust version

REI is among the highest-paid OB/GYN subspecialties, and its pay has risen sharply since about 2020. The unusual thing about REI money is why it's high: less about insurance reimbursement and more about a large cash-pay IVF market, aggressive private-equity (PE) consolidation of fertility clinics, fast-expanding employer fertility benefits, and ownership/equity economics. A note on sources first: neither Doximity 2025 nor Medscape breaks out REI as its own line, and they only publish parent OB/GYN (~$390k). REI-specific figures come from MGMA (member-only, secondhand and now dated), recruiter placement data, peer-reviewed REI studies, and PE-industry trackers. And beware generic aggregators (Glassdoor, ZipRecruiter, Salary.com posting data). Several show $124k–$296k, which badly understates the field and conflicts with every credible source and the cash-pay economics below.6789

National number. Depending on source and definition, credible REI total-comp anchors cluster around ~$572,000 (MaritHealth US average, ⟳ verify) to ~$725,000 (AMN Healthcare average placed, Dec 2025), with recruiter offer ranges of $450,000–$1,000,000. A defensible "typical full-time" read for mid-2026 is $570,000–$725,000 total compensation, well above general OB/GYN ($390k).678

The spread (structure). Floor ~$300k (academic / low-volume) → median ~$500k–$600k → strong private / PE-network ~$700k–$800k → owner/partner or high-volume ceiling $1M+. MGMA's (older, 2020–21) range runs $225k–$734k; AMN's current offer range tops out at $1.0M; a tiny SalaryDr panel (n=4, low confidence) puts the median at $700k with a $500k–$800k interquartile band.679 ⟳

Starting pay has escalated faster than any other career stage. Because PE-backed networks are bidding aggressively for a tiny graduating pool. A PE-industry tracker reports fellowship-graduate starting comp climbed from ~$400k (2020) to ~$650k (2026) at PE networks, roughly a 60% rise, and that PE networks captured about half of the 2024 graduating class (~30 of ~60 grads).7 ⟳

Academic vs. private is the biggest lever after ownership. Academic REIs get research, teaching, security, and benefits but a lower base (~$300k–$450k, ⟳ verify); private and PE-network practice pays materially more, and the top earners (>$500k) typically own their practice, trading upside for financial risk, overhead, and administrative burden. Peer-reviewed REI-specific studies confirm the private-over-academic gradient. ⟳789

Geography. Cash-pay-heavy, high-demand metros such as the Bay Area, greater LA, NYC, Boston, and Texas command premiums; California alone is roughly 18–20% of all US ART cycles, the largest single market. State IVF-coverage mandates (now 22 states + DC) shift some markets from cash-pay to insured; California's SB 729 (large-group effective Jan 1, 2026) is a major near-term example that converts substantial cash-pay demand to mandate-paid.7

The employment models. (1) Academic and hospital-employed: salaried, lowest band. (2) Independent private practice or partner-owner: base plus productivity plus profit and equity distributions; highest ceiling. (3) PE-backed fertility network (MSO): competitive base plus bonus plus retained equity, now the dominant hirer of new grads (e.g., US Fertility physicians retain ~15% equity post-recap).7

The cash-pay and IVF economics behind the pay, which is how to understand REI money. This is the part a premed would never pick up from a salary table:7

  • Cash-pay dominates. A single IVF cycle runs $20,000–$40,000 before medications; a full multi-cycle course can reach $60,000–$100,000 over 18–24 months. Only ~47% of large employers covered IVF in 2024, so roughly half of demand is cash-pay or partial.
  • Volume is high and growing. US ART cycles rose 33% from 2019 to 2022 (326,468 → 435,426 cycles, 94,039 live births), per SART/CDC data.
  • Ancillary cash-pay lines. Egg freezing, embryo banking, cryostorage, and donor gamete banks are separately valuable (deal multiples of 7x–9x EBITDA on add-ons).
  • Volume drives both pay and burnout: high-volume REIs run 350–400 IVF cycles/year, described in the trade press as the point where "life starts to sound crazy."
  • Even the embryology labor market is hot: senior embryologists / High-Complexity Lab Directors command $400k–$600k base + $50k–$100k sign-on amid a critical shortage, a signal of how much the lab side of this business is worth.

The PE trend that colors all of it. There are 11 active US fertility IVF MSO platforms (2024–26); by end-2023 PE sponsors controlled ~32% of clinics but performed ~54% of all IVF cycles. Recent deals are enormous (US Fertility + L Catterton recap $1.71B + $825M term loan, Dec 2025; IVI RMA/KKR + Eugin-Boston IVF $535M, Jan 2024; CCRM acquired by Unified Women's Healthcare $775M, Sept 2023). Wall Street frames fertility as roughly a $50B bet on family planning (⟳ verify). The upshot: money is flowing in, which lifts pay but also imports a throughput-and-margin culture (see wellbeing and the mission-tension note below).710 ⟳

A tail risk. Legal/regulatory shocks can move this market: the Alabama Supreme Court's LePage ruling (Feb 2024), classifying frozen embryos as children under wrongful-death law, chilled IVF in that state overnight, a reminder that REI's economics sit on contested legal ground in parts of the country.7

Gender pay gap within REI: unadjusted ~27%, adjusted (for practice type and experience) ~21%, notable in a field whose fellows are 80.4% women.6

Lifestyle & the "escape from OB call" bargain

The core draw is escaping labor-and-delivery call. General OB/GYN is defined by unpredictable deliveries, overnight L&D, and being pulled to the hospital at any hour, one of the more brutal call structures in medicine. REI is mostly outpatient, and its procedures, whether retrievals, transfers, or hysteroscopy, are booked rather than emergent. There are no babies to deliver at 3 a.m. That single trade is the biggest reason OB/GYNs gravitate here, and it's a genuine lifestyle upgrade over the parent field.23

But "no OB call" is not "easy," and outsiders oversell the chill. The real costs are different: early mornings for cycle monitoring (not late nights), 364-day clinic operations, weekend call roughly every 4–6 weeks, an average around ~50 hours/week, and an inbox that never really closes because patients are anxious about cycles and losses. It's calendar-driven and controllable, but busier and more tethered than the "basically 9-to-5" reputation implies.3

Schedule control is genuinely good and improves as an attending. Days are predictable, nights are rarely emergent, and the procedural work is scheduled. Kudesia describes getting life "back into a pretty good balance" once out of training. And career longevity is excellent, with no overnight L&D grind and largely elective, procedural work you can sustain into your 60s+, making REI one of the more age-friendly ways to practice out of an OB/GYN base.3

Lifestyle rating: 4/5. High control and predictability with no true emergency call, docked from a 5 by the early mornings, 364-day operation, and the always-on emotional/message load.

Wellbeing — the part to take seriously

Burnout: lower than the parent specialty, though nothing measures REI itself. OB/GYN ranks among the highest-burnout fields on the AMA's 2025 Organizational Biopsy, at 45.7% reporting at least one burnout symptom against a 41.9% all-physician average, fourth-highest of the nine it names.11 Medscape's 2024 report puts OB/GYN at 53% against its own 49% average, a comparable distance on a different instrument.12 Either way the parent field sits a few points above its own baseline rather than a dozen. Shedding L&D call is a major protective factor, and REIs generally report a more sustainable physical and emotional load than generalist OBs, but that is a mechanism rather than a measurement.13 ⟳

Satisfaction: high, with a caveat. REIs tend to describe the work as deeply gratifying: long relationships, birth announcements, thank-you notes. (Small self-reported salary-survey "would choose again" numbers are more mixed, but those samples are tiny; the stronger signal from specialty profiles and physician essays is real satisfaction.)39 ⟳

The emotional arc of hope and loss is the defining wellbeing feature, and it's heavy. This is not a low-stakes clinic. Patients arrive after years of trying, having invested enormous emotional and financial capital, and the hardest part of the job (per Kudesia) is telling someone a cycle failed after all of that. REI Dr. Oluyemisi Famuyiwa frames infertility as "grief suspended in uncertainty," a loss with no funeral and no shared language, where clinical terms like "poor responder" and "failed cycle" can land as personal verdicts. The REIs who thrive are the ones who can hold both the science and the grief.314

Career longevity of satisfaction: the combination of cutting-edge science, procedural work, deep patient relationships, and a humane schedule is a recipe many describe as staying in love with the job for decades.3

Who's in the field (demographics)

  • Women: ~80.8% of REI fellows on the 2024–25 GME census, just below OB/GYN trainees at ~88.6%; ACGME's own count for the same year gives 80.4% of REI fellows (148 of 184) and 88.2% of OB/GYN residents.1516 Both are training populations. The practicing workforce is an older stock and still catching up: when SREI surveyed board-certified REI subspecialists, 48.4% of the 370 respondents were women, a 27% increase in female respondents over a comparable survey six years earlier. The shift from male-majority to female-majority is well documented and projected to continue, and it is happening from the training end.17 ⟳
  • DO: 1 of 58 filled spots in the 2026 appointment year and 4 of 56 in 2025. Across 2022–2026 the count has run 1 to 4 a year, so REI is not especially DO-accessible, and a percentage on a denominator this small moves several points on one person.4 ⟳
  • IMG: 1 of 58 in 2026 and 2 of 56 in 2025, counting US-citizen and non-US-citizen graduates together; 1 to 6 a year across 2022–2026. A very small entry point.4 ⟳
  • US MD: 56 of the 58 filled spots in 2026, and 84% to 95% of positions offered across the last five appointment years, so REI is overwhelmingly a US-MD field.4 ⟳
  • Race/ethnicity (URiM): the field is predominantly White and Asian, with low representation of Black and Hispanic/Latino trainees. ACGME counts 184 REI fellows in AY2024-25: 97 White and 35 Asian, which is 71.7% between them, against 16 Hispanic or Latino and 16 Black or African American, 8.7% each, and none American Indian, Alaskan Native, Native Hawaiian or Pacific Islander. A study of ACGME reports from 2012 to 2018 found the same shape across the OB/GYN fellowships, with REI at 65.62% White trainees against 54.20% for OB/GYN residents.161819 ⟳

Culture, personality & the online stereotypes

This is a reputational, online-and-anecdotal read of who tends to gravitate to REI and how it's talked about, rather than a claim about any individual. Plenty of REIs don't fit any of it.

Who gravitates here: OB/GYNs who love the reproductive-science and procedural side of their field but want out from under L&D call, and who are drawn to a lucrative, controllable, technology-forward practice. The temperament that recurs in profiles: compassionate, persistent, and analytical; comfortable with both procedures and clinic; patient enough for a slower-paced but still high-stakes environment; and, in Kudesia's phrase, able to "ride the emotional rollercoaster" with patients. Many are simultaneously endocrine- and science-oriented and hope-oriented, people who like being at the frontier of reproductive technology and being the person who helps someone build a family. As always, plenty of people in the field do not fit any single mold.23

The stereotypes. Community caricatures rather than facts, each with an unfair edge:

  • "The lifestyle-plus-money jackpot of OB/GYN." Reality: the pay and the escape-from-call are real, but it flattens the emotional weight of the work and the brutal competitiveness of getting in.
  • "Basically a 9-to-5." Reality: early-morning monitoring, 364-day clinics, ~50-hour weeks, and an always-on inbox say otherwise.
  • "The cash-pay fertility gold rush." Reality: the cash-pay and PE economics are genuinely central to the field's money, but the caricature skips the science, the surgery, and the relationships.
  • "You stopped delivering babies." A gentle dig from generalist OBs. Reframed, it's exactly the point: the subspecialty that most helps make babies rarely delivers them.

What people say online (synthesized and paraphrased, not quotes): Across trainee and physician forums, REI is widely seen as the plum subspecialty, the payoff for surviving OB/GYN residency, the way to keep the surgical/reproductive parts of the field while ditching the worst hours, and one of the best paydays in women's health. The consistent counter-notes: fellowship is genuinely hard to land, the research bar is real, and the "chill lifestyle" idea oversells it (early mornings, 364-day clinics, emotionally heavy caseloads). Trainee discussion dwells on match competitiveness, the shift toward PE-owned networks, and a recurring tension: that a lucrative, largely cash-pay model can feel affluent-leaning and distant from underserved, mission-driven medicine. The honest through-line: people love the work and the life it enables, but tell you not to underestimate the climb to get in or the grief you carry once you're there.

Voices from the field. Paraphrased from public writing, with links to the originals:

  • REI Dr. Rashmi Kudesia, in the AMA specialty profile, gives the honest lifestyle picture: ~50 hrs/week, weekend call every 4–6 weeks, 364-day clinics, and the emotional highs and lows of the work.3
  • Dr. Kudesia also writes (in a personal essay) about the field's mission and a caution against over-aggressive, high-cost treatment escalation, since she's seen patients pushed into premature, expensive treatment.20
  • REI Dr. Oluyemisi Famuyiwa captures the emotional core, infertility as unspoken grief and an injury to identity, and calls for holistic, compassionate care.14
  • An ASRM / Fertility & Sterility report tells the private-equity story from inside the field: a meaningful share of REI fellowships and med schools now tied to investor-backed clinics, with concern about throughput culture, more non-specialist providers, and research/mission trade-offs.21

Why people choose it / why people leave

Why choose it: you escape OB/L&D call while keeping reproductive science and procedures · controllable, predictable, mostly-outpatient schedule with scheduled (not emergent) procedures · among the top earners in women's health · cutting-edge, fast-evolving technology (IVF, genetics, egg freezing) · deep, longitudinal patient relationships and a tangible "you helped make a family" reward · excellent career longevity.

Why leave or avoid it: one of the most competitive OB/GYN fellowships, not guaranteed even to strong residents · a long pipeline (4 + 3, with a research thesis) on top of med school · a relentless emotional load (failed cycles, miscarriage conversations, 24/7 patient anxiety) · early mornings and 364-day operations that blunt the "easy lifestyle" myth · growing PE ownership that can push volume/throughput and dilute autonomy · cash-pay economics that can feel misaligned with underserved/mission care.

Best fit if: you loved OB/GYN's reproductive and surgical side but hate the L&D call · you're analytical and science-driven but also emotionally steady · you want strong pay and a humane schedule · you can find meaning in a field that is often elective and affluent-leaning.

Not for you if: you need the adrenaline of deliveries and acute OB · you can't tolerate repeated bad-news conversations · you want a short training path · you're set on primarily serving underserved populations through insurance-based care · you dislike an increasingly corporate/PE-driven practice environment.

The FLI angle — REI for first-gen, low-income & immigrant students

REI is a rare combination of top-tier OB/GYN pay and one of the better lifestyles in women's health, reachable through a standard OB/GYN pathway, so you don't have to have chosen the "right" specialty on day one. For an FLI student, that's a genuinely powerful long-term financial ceiling paired with a sustainable schedule and excellent career longevity: you can earn near the top of women's medicine without the perpetual L&D grind.

Where REI fits FLI realities well:

  • A very high financial ceiling reached through a normal route. You get to OB/GYN like anyone else, then subspecialize, with no exotic early-track requirement.
  • A humane, sustainable schedule with long career longevity. Meaningful if you plan to support family over decades without burning out on overnight call.
  • Strong, and rising, compensation driven by the cash-pay and PE market, and starting pay in particular has climbed fast.

Risks to name honestly:

  • It's very competitive and the pipeline is long. You must first match OB/GYN, excel through a 4-year residency, build a research record, and then win one of only ~59 fellowship spots a year (and the field has run 84% to 95% US-MD across the last five years, with a handful of DO and IMG entrants a year). That's a long, high-stakes climb with no guarantee at the end, and a lot of years before attending income arrives, a real consideration if you need to start earning sooner.
  • The mission tension is real. Fertility care is largely cash-pay, skews toward patients who can afford it, and is increasingly owned by private equity focused on throughput and margin. For a student drawn to medicine to serve underserved communities, REI can feel far from that, because this is not front-line safety-net care. Be honest with yourself about whether the money-and-lifestyle draw and the mission draw point the same direction.

Bottom line: an outstanding financial and lifestyle target if you genuinely love reproductive medicine and can run the long, competitive OB/GYN-into-REI gauntlet, but choose it because you want the work, not only for the "jackpot" reputation.

Related paths & where REI sits

REI is one of the recognized subspecialty fellowships of OB/GYN, reached the same way, through a separate fellowship Match after residency. The others most often mentioned alongside it:15

  • Maternal-Fetal Medicine (MFM). High-risk pregnancy and the fetus; also highly competitive.
  • Gynecologic Oncology. Cancers of the female reproductive tract; surgery-heavy.
  • Female Pelvic Medicine & Reconstructive Surgery (Urogynecology). Pelvic floor disorders, incontinence, prolapse.
  • Complex Family Planning. Contraception and abortion care.
  • Within REI itself, practices cluster informally by flavor: academic and research-oriented, high-volume private IVF, or the surgical/endometriosis-heavy end.

Sub-subspecialties & fellowships

REI is one of OB/GYN's subspecialty fellowships rather than a field with fellowships of its own.

  • Its siblings are the comparison worth making. Maternal-fetal medicine, gynecologic oncology, urogynecology and complex family planning are the other routes out of the same residency, and they differ sharply in length, pay and operative load.
  • Nothing formal sits beneath it. Practices differentiate by laboratory relationship and case mix, particularly how much of the work is IVF, and that is a business question as much as a clinical one.

Fun facts

  • Fertility clinics essentially never close. Many run 364 days a year, because monitoring cycles can't pause for weekends or holidays.3
  • REI is the subspecialty OB/GYNs choose because it lets them stop delivering babies, so the field that most helps make babies rarely delivers them.2
  • It's a tiny field: only ~1,300 board-certified REIs nationally, with roughly 60–68 new fellows a year (⟳ verify exact counts).7
  • REI is unusual in blending bench-style science, a surgical/procedural skill set, and long-term hope-driven relationships, and few specialties span all three.3
  • Private equity has swept the field: by end-2023, PE-backed networks controlled ~32% of clinics but performed ~54% of all US IVF cycles.7
  • US ART cycle volume jumped 33% in just three years (2019→2022), a demand surge that underwrites both the pay and the burnout risk.7

Sources

Footnotes

  1. REI training pathway, 3-year fellowship structure (18 mo clinical / 12 mo research-thesis / 6 mo elective), program counts (~52 ACGME programs, ~68 grads/yr), and ABOG subspecialty certification. ASRM Practice Committee, "The reproductive endocrinology and infertility subspecialist: definition, training, and scope of practice in the United States" (2025). https://www.asrm.org/practice-guidance/practice-committee-documents/the-reproductive-endocrinology-and-infertility-subspecialist-definition-training-and-scope-of-practice-in-the-united-states-2025/ ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9

  2. REI scope of practice, procedures, who-gravitates, and "escape from OB call" framing. Med School Insiders, "So You Want to Be a Reproductive Endocrinologist" (2026). https://medschoolinsiders.com/pre-med/so-you-want-to-be-a-reproductive-endocrinologist/ ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7

  3. Day-in-the-life, ~50 hrs/week, weekend call every 4–6 weeks, 364-day clinics, schedule control, career longevity, and the emotional arc. AMA, "What it's like in reproductive endocrinology and infertility: Shadowing Dr. Kudesia." https://www.ama-assn.org/medical-students/preparing-residency/what-it-s-reproductive-endocrinology-and-infertility-shadowing ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13 ↩14 ↩15

  4. REI fellowship Match data (2026 Appointment Year), Tables 1A and 2: 46 programs, 59 positions, 58 filled (98.3%), 73 applicants (~1.2:1), 1 program left unfilled; US MD 96.6%, US DO 1.7%, non-US IMG 1.7%, US-citizen IMG 0. NRMP, Results and Data: Specialties Matching Service, 2026 Appointment Year (Feb 2026). https://www.nrmp.org/wp-content/uploads/2026/02/SMS_Results_and_Data_Report2026.pdf The same report's five-year trend tables, on a positions-offered denominator, give the US MD share as 94.9% (2026, 59 positions), 84.7% (2025, 59), 83.9% (2024, 56), 87.5% (2023, 48) and 89.8% (2022, 49); DO entrants as 1, 4, 2, 1 and 1; US-citizen IMGs as 0, 2, 4, 1 and 2; and non-US-citizen IMGs as 1, 0, 2, 4 and 2. Corrected 2026-08-17: the dashboard and the demographics bullets carried the 2025 appointment year (89% US MD, 7% DO, 4% IMG) with no year printed on them, while the competitiveness section eighty lines above carried 2026 (96.6% / 1.7% / 1.7%). Neither set was misread; every figure in both is exact. The problem was that a reader met the undated pair first and then hit a fourfold-different DO figure with no explanation. Both now run on the five-year series, because a single cycle here is noise: with 58 filled spots, one DO is 1.7% and four is 7.1%. ⟳ ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7

  5. REI as one of the most competitive OB/GYN fellowships (normalized competitive index; the index values themselves sit behind the publisher's paywall). Gressel et al., "Analyzing trends in obstetrics and gynecology fellowship training over the last decade using the normalized competitive index," F&S Reports (2022). https://www.sciencedirect.com/science/article/pii/S2666577822000569 ↩ ↩2 ↩3 ↩4

  6. MGMA-based REI median/range and gender pay gap (unadjusted ~27%, adjusted ~21%). PhysiciansThrive, "Reproductive Endocrinologist Salary Range" (MGMA 2021 basis). https://physiciansthrive.com/physician-compensation/reproductive-endocrinologist/ ↩ ↩2 ↩3 ↩4

  7. Cash-pay IVF economics, ART volume growth, PE roll-up shares/deals, starting-salary escalation (~$400k→$650k), employment models, embryologist pay, workforce scarcity (~1,300 REIs, ~60 grads/yr), CA SB 729, state mandates, LePage ruling. CT Acquisitions, "Fertility IVF PE Roll-Up Tracker 2026" (2026). https://ctacquisitions.com/guides/fertility-ivf-pe-rollup-tracker-2026/ ↩ ↩2 ↩3 ↩4 ↩5 ↩6 ↩7 ↩8 ↩9 ↩10 ↩11 ↩12 ↩13

  8. Market total-comp anchors. No compensation survey isolates REI. A recruiter listing (AMN Healthcare, Dec 2025) put the average placement at $725k against an offer range of $450k–$1.0M; that page has since been taken down, and a job advertisement is a marketing document rather than a survey, so treat the figure as an order of magnitude rather than a median. MaritHealth US ~$572k / TX ~$579k (2026, verify) https://www.marithealth.com/o/-/reproductive-endocrinologist/salary On Marit Health: it publishes a panel of self-reported physician salaries, and displays MGMA and AMGA benchmarks beside them that are masked unless you create an account. The figure quoted here comes from the self-reported panel, not from either benchmark. Read it as crowd data: unweighted, of unstated sample size, and directional. ↩ ↩2 ↩3

  9. Career-stage and academic-vs-private/owner bands ($300k academic → $500k+ experienced → $500k–$1M+ owner); SalaryDr median ~$700k (n=4, low confidence). ICGI, "How Much Do Fertility Doctors Make a Year?" (Mar 2026) https://www.icgi.org/how-much-do-fertility-doctors-make-a-year/ ; SalaryDr, "Reproductive Endocrinology Physician Salary" (Jun 2026) https://www.salarydr.com/specialty/reproductive-endocrinology ; peer-reviewed academia-vs-private studies (exact deltas verify): Fertility & Sterility (2025) https://www.sciencedirect.com/science/article/pii/S0015028225001402 and (2023) https://www.fertstert.org/article/S0015-0282(23)01154-8/fulltext ↩ ↩2 ↩3 ↩4

  10. Fertility framed as a ~$50B market bet. News Anyway, "The Fertility Industry Boom: Wall Street's $50 Billion Bet" (May 2026) https://www.newsanyway.com/2026/05/13/the-fertility-industry-boom-wall-streets-50-billion-bet-on-the-future-of-family-planning/ ; Fertility Bridge, "Fertility Sector Year in Review 2025" https://www.fertilitybridge.com/news-articles/fertility-industry-year-in-review-2025 ↩

  11. National physician burnout ~42% in 2025 (OB/GYN typically above average). AMA / Fierce Healthcare. https://www.fiercehealthcare.com/providers/physician-burnout-falls-third-year-2025-419-american-medical-association ↩

  12. OB/GYN burnout ~53% (2024). Medscape 2024 Burnout & Depression Report, via Becker's ASC. https://www.beckersasc.com/asc-news/the-20-physician-specialties-with-the-highest-lowest-burnout-rates/ ↩

  13. Parent OB/GYN compensation context (~$390k). Doximity 2025 Physician Compensation Report (https://www.doximity.com/reports/physician-compensation-report/2025); Medscape OB/GYN Compensation Report 2026 via Nuaxia (https://www.nuaxia.com/post/medscape-ob-gyn-compensation-report). ↩

  14. The emotional core — infertility as "grief suspended in uncertainty." Oluyemisi Famuyiwa, MD, "The emotional impact of infertility is grief unspoken," KevinMD (2026). https://kevinmd.com/2026/05/the-emotional-impact-of-infertility-is-grief-unspoken.html ↩ ↩2

  15. REI ~80.8% women vs OB/GYN ~88.6% (2024–25 GME census). AMA analysis of AAMC/AMA National GME Census, reported Nov 2025. https://www.ama-assn.org/medical-students/preparing-residency/these-physician-specialties-have-biggest-gender-imbalances ↩

  16. ACGME, Data Resource Book, Academic Year 2024-2025, read directly. Table C.21 (sex): reproductive endocrinology and infertility, 52 programs, 184 fellows, 148 women (80.4%), 36 men (19.6%); obstetrics and gynecology, 303 programs, 6,178 residents, 5,450 women (88.2%). Table C.23 (race/ethnicity): REI 97 White, 35 Asian, 16 Hispanic or Latino, 16 Black or African American, 0 American Indian or Alaskan Native, 0 Native Hawaiian or Pacific Islander, 9 multiple, 9 other, 2 unknown, summing to the same 184. Sex and race/ethnicity in this book are self-reported and supplied by the AAMC, and both tables count people in training. https://www.acgme.org/globalassets/pfassets/publicationsbooks/2024-2025_acgme_databook_document.pdf ↩ ↩2

  17. The shift to female-majority REI, and the practicing-workforce figures. Marsh et al., "Changing gender gap and practice patterns in reproductive endocrinology and infertility subspecialists in the United States: a Society for Reproductive Endocrinology and Infertility report," Fertility and Sterility 2022 (online 2021), PMID 34980431. A cross-sectional web survey of board-certified REI subspecialists, 370 respondents, 48.4% women and 51.4% men, a 27% increase in female respondents over a comparable survey six years earlier; 77% felt positively about the state of the field and more than 90% would choose the subspecialty again. It also reports a marginally significant compensation gap, women $472,807 against men $571,969, and a private-versus-academic gap of $820,997 against $391,600 at ten or more years. https://www.fertstert.org/article/S0015-0282(21)02132-4/fulltext Corrected 2026-08-17: this footnote previously carried the note "exact percentages not verifiable (403)" and no figures. The paper's abstract is open at Europe PMC and its numbers are above; the demographics bullet now distinguishes the training population from the practicing one, which this survey measures. ↩

  18. Talbott JMV, Wasson MN, "Sex and Racial/Ethnic Diversity in Accredited Obstetrics and Gynecology Specialty and Subspecialty Training in the United States," Journal of Surgical Education 2022;79:818–827, from ACGME reports covering 2012 to 2018: REI 65.62% White trainees and 20.09% men, against 54.20% White for OB/GYN residents and 42.96% for residents overall (p = 0.0003 for the racial comparison). The paper found no statistically significant trend in sex or race over those seven years. https://pubmed.ncbi.nlm.nih.gov/35033485/ ↩

  19. REI trainees predominantly White and Asian, low URiM representation. "Gender and racial diversity in reproductive endocrinology and infertility trainees in the United States," Fertility and Sterility (2021). https://www.fertstert.org/article/S0015-0282(21)00805-0/fulltext ; https://pubmed.ncbi.nlm.nih.gov/34756621/ The counts the bullet quotes come from ACGME's own book, 16, and the trend study, 18. Corrected 2026-08-17: the demographics bullet and this footnote both told the reader the exact percentages were unverifiable and printed an HTTP status code. The claim is now carried by two sources that publish figures. ↩

  20. Mission and a caution against premature/expensive treatment escalation. Rashmi Kudesia, MD, "On Being a Fertility Specialist" (Medium). https://medium.com/@rashmi.kudesia/on-being-a-fertility-specialist-1ec6f7615118 ↩

  21. The private-equity story from inside the field — investor-linked fellowships/med schools, throughput culture, research/mission trade-offs. Fertility & Sterility Reports / ASRM (PMC), "Changes to REI practice, research, and training as investor mergers increase." https://pmc.ncbi.nlm.nih.gov/articles/PMC10774877/ ↩

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