Endometriosis and IVF: Does Surgery Improve Success Rates?

Often less than people fear. A 2024 systematic review and meta-analysis of 40 studies, comparing 8,970 women with endometriosis against 42,946 without, found no significant difference in live birth rates after IVF (odds ratio 1.03). Clinical pregnancy and fertilisation rates were also similar. Only the implantation rate was modestly lower (odds ratio 0.85).

So the headline is reassuring. The detail matters more. The large SART database study showed that women whose only diagnosis is endometriosis tend to have live birth rates close to, or even better than, other infertility groups. Outcomes drop mainly when endometriosis sits alongside other problems, like male factor or tubal disease. The disease can lower how many eggs you produce, but it doesn't automatically lower your odds of a baby.

Mostly egg quantity, not your final outcome. In the SART analysis of US IVF cycles, endometriosis was linked to a lower oocyte yield compared with tubal factor and several other diagnoses. Fewer eggs at retrieval can mean fewer embryos to choose from, which is why doctors watch ovarian reserve closely in these patients.

Endometriomas, the ovarian cysts caused by endometriosis, are a big part of this story. They sit on the ovary and can crowd out healthy egg-producing tissue. They can also make it physically harder to reach follicles during egg collection. That accessibility problem, plus pain, is one of the few clear reasons surgery genuinely earns its place before IVF.

This is where good intentions can backfire. Removing an endometrioma sounds logical, but a 2025 meta-analysis found that laparoscopic cystectomy causes a real and lasting drop in AMH, a key marker of ovarian reserve. The fall was significant at every time point measured, and it didn't recover. At six to eighteen months after surgery, average AMH was about 2.12 ng/mL lower than before.

That's the trade-off. You might clear the cyst, but you may also remove or damage healthy ovarian tissue along with it, leaving fewer eggs for IVF. For a woman whose reserve is already borderline, or who has cysts on both ovaries, this can do more harm than the cyst itself. Surgery is not a tidy first step. It's a decision with a cost.

It advises against routine surgery before IVF. The 2022 ESHRE endometriosis guideline gives a strong recommendation that clinicians should not routinely operate on an ovarian endometrioma before ART to improve live birth rates, because current evidence shows no benefit and surgery is likely to harm ovarian reserve.

The guideline doesn't ban surgery. It reframes it. Operating before IVF can still be considered to relieve endometriosis pain or to improve access to follicles for egg retrieval, as long as the risk to ovarian reserve is weighed in the conversation. In short, surgery for symptoms or access can be reasonable. Surgery purely to boost IVF numbers is not supported.

For endometriomas, the honest answer is no clear benefit. A Cochrane review of randomised trials in women with endometriomas before ART found no evidence that cystectomy or cyst aspiration improved clinical pregnancy compared with simply leaving the cyst alone. A 2018 meta-analysis agreed, finding no improvement in clinical pregnancy (odds ratio 1.08) or egg yield after removing the cyst before IVF or ICSI.

Deep infiltrating endometriosis (DIE) may be different. This is severe disease invading tissue like the bowel, bladder, or pelvic ligaments. A 2021 meta-analysis suggested that surgery for DIE before IVF was linked to higher live birth rates per patient (odds ratio 2.22). That's encouraging, but it comes from observational data, not randomised trials, so it should guide discussion rather than settle it.

The right answer depends on you, not a single rule. Surgery before IVF tends to help when there's significant pain, when a large cyst blocks safe access to your follicles, or in selected cases of deep infiltrating endometriosis. In these situations the benefit can outweigh the hit to ovarian reserve.

It's usually best avoided when the main goal is just to remove an endometrioma to lift IVF success, when your AMH or antral follicle count is already low, when both ovaries are affected, or when you've had previous ovarian surgery. For many women, going straight to IVF and leaving a quiet endometrioma in place is the kinder, evidence-based path. Ask your specialist to explain the trade-off in your specific case before agreeing to any operation.