Short answer: A PCOS diagnosis does not automatically mean IVF. Many women conceive with lifestyle changes and ovulation medication. IVF comes into play when those steps do not work or when another factor is present. What matters is knowing that ovaries with PCOS respond differently, and planning treatment around that.

PCOS has a new name: what is PMOS?

In May 2026 an international consensus published in The Lancet renamed PCOS as “polyendocrine metabolic ovarian syndrome” (PMOS). The process involved 56 academic, clinical and patient organizations, and more than 14,000 patients and health professionals answered the surveys. The reason is that the word “polycystic” is misleading: the small follicles seen on ultrasound are not diseased cysts but immature egg sacs. The old name also hid the hormonal and metabolic (sugar, weight) side of the condition. This is a naming decision; it does not by itself change how the condition is diagnosed or treated, and the switch is planned to unfold over about three years. In this article I keep using “PCOS”, because it is still the name most patients know and search for; PMOS means the same condition. If you see PMOS in a report or online, it is the same diagnosis.

What is PCOS, in simple terms?

PCOS is a hormonal imbalance in which the ovaries struggle to release an egg regularly. Periods become infrequent or absent, the ultrasound shows many small follicles, and some women notice extra hair growth or acne. Those small sacs are not true “cysts”; they are immature egg follicles. The issue is irregular ovulation, not a lack of eggs.

What is tried before IVF?

• Weight and lifestyle: Losing even 5-10% of body weight can restore ovulation.
• Ovulation medication: Tablets stimulate ovulation, monitored by ultrasound.
• IUI (insemination): An option if ovulation is restored but pregnancy has not happened, tubes are open and sperm is suitable.

When is IVF considered?

• No pregnancy after several cycles of ovulation medication,
• Blocked tubes, a male factor or endometriosis alongside PCOS,
• Advancing maternal age when time matters,
• A need for embryo genetic testing.

Why do PCOS ovaries behave differently in IVF?

PCOS ovaries hold many follicles that are very sensitive to stimulation drugs. This can mean more eggs, but also a higher risk of ovarian hyperstimulation syndrome (OHSS), where the ovaries swell and fluid can collect in the abdomen. With careful planning, this risk can be greatly reduced.

How is a safe cycle planned?

• Individualized dosing: A gentle dose tailored to your ovarian response.
• Suitable protocol and trigger: Choices that lower overstimulation risk.
• Freezing embryos: When risk is higher, embryos are frozen and transferred in a later, calmer cycle.
• Close monitoring: Regular ultrasound and hormone checks.

What are the chances?

Women with PCOS often produce many eggs, which can help with embryo numbers. Still, results depend on age, egg and embryo quality, the uterus and sperm quality, so no one can promise a specific outcome. You can find our general figures and approach on the page covering all details of IVF treatment at our clinic in Istanbul.

What can you do before trying to conceive?

• Balanced diet and regular activity,
• Checking blood sugar and insulin levels,
• Avoiding smoking and alcohol,
• Folic acid as advised by your doctor.

Book a consultation

If you have PCOS and are planning a pregnancy, let us work out the right next step together. Contact Prof. Dr. Murat Arslan at Biruni University Hospital through the contact details on our website.

Source: Teede HJ et al. The Lancet 2026;407:2329-2339 (doi:10.1016/S0140-6736(26)00717-8).

This article is for general information and does not replace a personal medical assessment.