A septum in the womb — clinically a uterine septum or septate uterus — is a wall of tissue that divides the inside of the uterus down the middle. It is the most common congenital uterine anomaly, present in about 1–15‰ (ASRM 2024 guideline) of the general population and accounting for roughly 55% of all Müllerian (uterine development) anomalies, and it is strongly linked to first-trimester miscarriage.
This guide is compiled by the ProIVF Medical Editorial Team from the ASRM 2024 uterine septum guideline, the ESHRE/ESGE classification, and peer-reviewed reproductive-medicine studies, and reviewed by the ProIVF Medical Advisory Board. It explains what a uterine septum is, how it is diagnosed, when surgery is worth it, and how it changes an IVF plan.
What exactly is a septum in the womb?
A uterine septum is a band of tissue running down the centre of the uterine cavity, splitting it into two compartments. Unlike some other uterine anomalies, the outside shape of the uterus looks normal — the division is only on the inside.
Why it forms
During embryonic development the two Müllerian ducts fuse to build the uterine cavity. A septum remains when that fused wall fails to be reabsorbed after birth. It is therefore a remnant of normal development that did not complete, not a growth or a tumour.
Partial vs. complete septum
Under the ESHRE/ESGE classification a septate uterus is graded U2, in two forms:
- Partial septum (U2a) — the wall reaches partway into the cavity.
- Complete septum (U2b) — the wall runs the full length of the cavity, sometimes to the cervix.
Severity is measured by how far the septum protrudes relative to the cavity and the depth of the indentation on the top of the uterus.
How common is it?
The septate uterus is the single most frequent uterine anomaly. Reported prevalence is about 2.3% in the unselected population and up to 1.5% in reproductive-age women, but the figure climbs sharply among women who have already had recurrent pregnancy loss.
Does a septum in the womb cause infertility or miscarriage?
A uterine septum mainly harms pregnancy after implantation rather than preventing conception, which is why many women learn they have one only after losses. The mechanism is straightforward.
The septal tissue has poor blood supply and a thin, poorly developed lining (decidua). When an embryo implants on the septum, the placenta cannot establish adequate circulation, so the pregnancy often stops in the first trimester. Observational data show women with a septate uterus have a first-trimester miscarriage rate of about 42%, versus roughly 12% in women with a normal cavity.
A septum does not usually raise the risk of second-trimester loss or preterm birth once a pregnancy has progressed, which distinguishes it from a weak cervix or a bicornuate uterus. Many carriers conceive naturally — the problem is carrying the pregnancy to term.
How is a uterine septum diagnosed?
Diagnosis has shifted from invasive testing to imaging that measures the outer contour of the uterus, because a true septum and a bicornuate uterus (which has an indented outer surface) look identical inside but are managed very differently.
3D transvaginal ultrasound and saline sonogram
Three-dimensional ultrasound is now the first-line test: it visualises the fundal contour and the septum length in one painless scan. A saline infusion sonogram (SIS) — sterile fluid instilled into the cavity — sharpens the picture and can measure septum length directly.
Hysteroscopy: the gold standard
Hysteroscopy (a camera passed into the cavity) remains the diagnostic gold standard because it both confirms the septum and allows treatment in the same session. It is usually reserved for when imaging is inconclusive or when surgical correction is already planned.
HSG and MRI
An HSG (dye X-ray of the cavity) can suggest a septum but cannot see the outer contour, so it cannot reliably separate a septum from a bicornuate uterus. MRI resolves that ambiguity when ultrasound is unclear. If you are having a saline sonogram or an HSG as part of an IVF workup, a septum is often picked up incidentally on those studies.
Is surgery always needed for a uterine septum?
Not always. Surgery is recommended when the septum is large and the woman has a history of miscarriage or failed implantation — not for an incidental, asymptomatic finding.
Hysteroscopic septum resection is recommended for women with a septate uterus and a history of recurrent pregnancy loss; in properly selected patients, live birth rates rise from roughly 5–15% before correction to 60–70% afterward. — ASRM Practice Committee, Evidence-based diagnosis and treatment for uterine septum: a guideline, Fertility & Sterility, 2024
What the operation involves
Hysteroscopic metroplasty is a same-day, keyhole procedure — no abdominal incision. A surgeon cuts the avascular septal band under camera guidance, taking care not to breach the healthy myometrium. The operation typically takes 20–40 minutes under light anaesthesia, and most patients go home the same day.
Recovery and waiting period
After resection, doctors usually advise waiting 1–2 normal menstrual cycles before a transfer or trying to conceive, so the endometrium fully heals. In rare cases a second-look hysteroscopy confirms the cavity is open, and a small residual septum of less than 1 cm has been shown not to worsen reproductive outcomes.
How does a uterine septum affect IVF?
For most IVF patients the question is not whether a septum blocks fertilisation — it does not — but whether it should be corrected before transferring an embryo.
- Before transfer. When a septum is found during the IVF workup and the patient has had losses or repeated failures, clinics commonly perform hysteroscopic resection and clear the cavity before the first transfer. This matters most in repeated implantation failure, where a mechanical obstruction is one of the correctable causes.
- With PGT-A. Because embryo chromosomal abnormality drives half or more of early losses, correcting the septum is only one piece. In a recurrent pregnancy loss workup, a septum is treated alongside genetic causes (PGT-A) and immune or clotting causes so that no cause is left unaddressed.
- At the clinic. Septum resection is a precise resection best done where the centre performs hysteroscopy on site rather than outsourcing it — one reason patients choosing overseas reproductive centres ask whether the surgery is in-house.
Is the surgery actually worth it? The honest picture
The strongest pro-surgery signal comes from the ASRM 2024 guideline and a run of observational cohorts showing live birth rates jumping from the 5–15% range to 60–70% after resection in women with recurrent loss. Cohort studies consistently support it: one 2014 prospective series of 48 patients reported a 68.9% live birth rate and no residual septum on follow-up imaging.
But the evidence is not unanimous, and you deserve to hear the other side. A 2025 propensity-score-matched study in Reproductive Biology and Endocrinology followed 113 women who had septum resection before IVF, 34 who chose expectant management, and 147 with normal uteri. Cumulative live birth rates were 47.79%, 52.94%, and 53.06% respectively — no significant advantage for resection, though the septum groups did show lower clinical pregnancy and higher miscarriage rates than normal uteri. The authors concluded that data remain insufficient for a firm consensus and that the decision needs individual counselling.
The practical reading: resection carries the clearest benefit for women with a large septum plus recurrent miscarriage, is a low-risk day procedure, and can be reconsidered case by case for asymptomatic or small septa. Uterine rupture after resection is a very rare but serious complication, which is why experienced surgeons cut only the avascular band.
What one cycle actually looked like
Patient stories are shared with consent and identifying details changed, to illustrate real scenarios rather than to promise results.
Lin, 33, two prior losses. After a second miscarriage at 9 weeks, a 3D scan showed a complete septum reaching the cervix. She underwent 30-minute hysteroscopic resection at a reproductive centre in Bangkok (out-of-pocket about US$2,800 for the procedure), waited two cycles, then began IVF. “The scan finally explained why we kept losing pregnancies,” she said. Her first transfer after correction implanted, and she delivered a healthy girl at 38 weeks.
Karen, 37, three failed transfers. Facing a repeated implantation failure workup in Malaysia (cycle cost roughly US$9,000), a saline sonogram revealed a partial septum. “My clinic wanted the cavity cleared before spending another embryo,” she recalled. The resection cost about US$1,500, and her next transfer — using a PGT-A-tested euploid embryo — resulted in an ongoing twin pregnancy.
Not everyone needs surgery. Amara, 29, found an incidental 6 mm partial septum during a fertility check with no loss history; her doctor recommended proceeding directly to timed intercourse with no operation, and she conceived within four cycles.
Frequently asked questions (FAQ)
Q: Can I get pregnant if I have a septum in my womb?
Yes. A uterine septum usually does not stop conception — many carriers conceive naturally. The dominant problem is miscarriage after implantation, with first-trimester loss reported around 42% versus 12% in normal cavities.
Q: Does removing the septum improve IVF success?
For women with a large septum and a history of loss or failed transfers, hysteroscopic resection before transfer is associated with live birth rates rising from roughly 5–15% to 60–70% in guideline-cited cohorts. A 2025 matched study found no significant difference versus expectant management, so the benefit depends on your specific history.
Q: How is a uterine septum different from a bicornuate uterus?
Both divide the cavity, but a septum has a normal outer contour while a bicornuate uterus has an indented, heart-shaped outside. Only 3D imaging or MRI that sees the outer surface can tell them apart, and management differs — a septum is treated hysteroscopically, a bicornuate uterus usually is not.
Q: How long do I wait after septum surgery before IVF transfer?
Most clinics wait 1–2 normal menstrual cycles for the endometrium to heal. Waiting this period before a transfer is standard guidance and applies whether you conceive naturally or through IVF.
Q: Is hysteroscopic septum resection risky?
It is a same-day 20–40 minute keyhole procedure without abdominal incision, and serious complications are uncommon. The rarest but most serious is uterine rupture in a later pregnancy, which is why surgeons cut only the avascular septal band and avoid the myometrium.
Q: Do I need surgery if the septum was found by accident?
Not necessarily. Current evidence does not support routine removal of an incidental, small septum (roughly under 1 cm) in a woman with no miscarriage history. Discuss whether the finding explains any of your own symptoms before agreeing to operate.
Q: Will insurance cover septum removal?
Hysteroscopic metroplasty for a diagnosed septum after 2 or more losses is often covered as a medical procedure, while removal done purely as an IVF-preparation step may be self-paid. Coverage varies by plan and country, so confirm with your insurer before booking.
Planning your next step
A septum in the womb is one of the most treatable causes of recurrent loss — but “treatable” is not the same as “always needs treating.” The right move depends on the septum size, your miscarriage or transfer history, and whether the cavity is being cleared before an IVF transfer. If you are weighing IVF abroad, choose a centre that performs hysteroscopy on site and reviews each cause of loss rather than defaulting to another transfer.
Explore reproductive centres and their services, and if you want a second read on your scan and history, contact our medical team for guidance on whether correction is worth it in your case.
This article is general health information, not medical advice. Diagnosis and treatment decisions for a uterine septum should be made with a reproductive-medicine specialist who has reviewed your imaging and history.
Sources
- ASRM Practice Committee. Evidence-based diagnosis and treatment for uterine septum: a guideline. Fertil Steril. 2024;122(2):251-265. PMID 38556964
- Zhang W, et al. Effect of hysteroscopic septum resection on IVF/ICSI outcomes in women with septate uterus: a propensity-score retrospective matching study. Reprod Biol Endocrinol. 2025. PMC11978180
- ESHRE/ESGE consensus on the classification of female genital tract congenital anomalies. Hum Reprod. 2013. PMID 23771171
Prepared by the ProIVF Medical Editorial Team and reviewed by the ProIVF Medical Advisory Board. We compile evidence from peer-reviewed guidelines and studies to support informed decisions — not to rank pages. See our about page for the editorial process.
Last updated: October 28, 2026
