Polycystic Ovary Syndrome (which was renamed to PMOS polyendocrine metabolic ovarian syndrome on 5/12/26) is one of the most common hormonal conditions affecting women of reproductive age, impacting an estimated 8-15% of women worldwide. However, up to 70% of cases are undiagnosed, making it a significant concern for both patients and healthcare professionals. For many, one of the most pressing concerns is how PCOS / PMOS affects egg quality and ovarian reserve. Understanding this connection can help women make informed decisions about their fertility journey.
How PCOS / PMOS Is Diagnosed
PCOS / PMOS is typically diagnosed using the Rotterdam criteria, which requires at least 2 out of 3 of the following:
- Irregular or absent ovulation (leading to irregular menstrual cycles)
- Laboratory or clinical signs of excess androgens (such as acne, hair thinning, or excess body hair growth)
- Polycystic-appearing ovaries on ultrasound (multiple small follicles)
This broad definition means PCOS / PMOS can look very different from woman to woman, ranging from those who ovulate regularly to those who rarely or never ovulate.
PCOS / PMOS and Ovarian Reserve: More Eggs, Different Challenges
One of the unique features of PCOS / PMOS is that women often have a higher number of small follicles seen in their ovaries on ultrasound compared to women without PCOS / PMOS. And in general women with PCOS / PMOS have larger pools of eggs in their ovaries, so they do have higher ovarian reserve. However, having many follicles does not always mean that those eggs will develop and mature properly.
In fact, PCOS / PMOS is often characterized by what’s called “arrested follicular development.” This means that although multiple eggs start to grow each cycle, they often don’t mature to the point of ovulation. This can lead to irregular or absent ovulation and difficulty conceiving.
Egg Quality vs. Egg Quantity
It is important to distinguish between egg quantity (ovarian reserve) and egg quality. Ovarian reserve refers to the number of eggs remaining in the ovaries, often measured by tests like AMH (anti-Müllerian hormone) or antral follicle count (AFC). Egg quality, on the other hand, refers to how healthy an egg is and whether it has the right number of chromosomes to result in a viable pregnancy.
Women with PCOS / PMOS generally do not have diminished ovarian reserve. In fact, their AMH levels are often higher due to the increased number of follicles. However, women with PCOS / PMOS tend to have poorer quality eggs because proper maturation of eggs/follicles is often disrupted. Factors such as insulin resistance, chronic low-grade inflammation, and hormonal imbalances (like excess androgens) may affect how eggs mature and whether they can be fertilized successfully.
Why Egg Quality Matters
Egg quality is crucial because even if you have a high number of eggs, only healthy, mature eggs can result in successful fertilization by the sperm and a healthy pregnancy. Poor egg quality increases the risk of:
- Irregular ovulation or anovulation (no ovulation)
- Implantation failures
- Higher miscarriage risk
- Lower success rates with fertility treatments such as IVF
Improving Fertility in PCOS / PMOS with a Root-Cause Approach
The good news is that it is possible to improve egg quality in women with PCOS / PMOS! This is because egg quality is influenced by both underlying health conditions and lifestyle. For women with PCOS / PMOS, supporting egg health often means addressing root causes:
- Balancing Blood Sugar & Insulin: Nutrition and lifestyle strategies that improve insulin sensitivity can help restore healthier ovulation
- Reducing Inflammation: Anti-inflammatory foods, supplements like omega-3 fatty acids, and stress management can make a difference
- Balancing Related Hormones: Balancing thyroid, prolactin, and androgens to optimized levels for fertility can help create a more favorable environment for egg maturation.
- Targeted Supplements: Certain supplements, like inositol, vitamin D, and CoQ10, have shown promise in improving ovulatory function and egg quality in PCOS / PMOS
- Lifestyle Factors: Prioritizing good sleep, regular movement, and minimizing exposure to toxins support overall reproductive health
Why Ovulation Alone Isn't Enough
When PCOS / PMOS women seek out their OBs for fertility help, they are frequently prescribed Letrozole (Femara) or Clomiphene (Clomid). While these medications can stimulate ovulation in up to 80% of cycles, studies consistently show that this does not always translate into healthy pregnancies. In the landmark NEJM trial, live birth rates were 27.5% for letrozole compared to 19.1% for clomiphene, and another study reported 25.4% versus 10.9%, respectively. These findings highlight an important reality: ovulation alone does not guarantee a baby nine months later. The reason is that, while these medications are pretty good at making the ovaries release eggs, they do not correct the underlying drivers of PCOS—such as insulin resistance and elevated androgens—that directly impair egg quality and overall reproductive health.
Why Improve Egg Quality First
This is why the more important question for women with PCOS / PMOS is not simply “Did I ovulate?” but rather “Was my ovulation healthy and of good quality?”
In my practice, I first focus on finding and addressing the underlying hormonal imbalances that can contribute to decreased egg quality in women with PCOS / PMOS. And only after I have improved these hormones to optimal ranges for fertility, I then would consider using pharmacologic ovulation strategies. This practice reduces rates of pregnancy loss in women with PCOS / PMOS, reducing the frustrations that come with these losses, and it also supports the women's overall health and reduce the likelihood that her future daughter will also have PCOS / PMOS!
This root-cause approach also gives women with PCOS / PMOS more control over their fertility journey and often makes fertility treatments more successful.
Why IVF Doesn't Fix Egg Quality
Many women are told that if ovulation medications don’t work, the next step is in vitro fertilization (IVF). While IVF can bypass problems with egg release by retrieving eggs directly from the ovaries, it cannot improve egg quality. The quality of the eggs still depends on the hormonal and metabolic environment in which they developed. If insulin resistance, high androgens, or inflammation are left unaddressed, IVF may still result in poor-quality embryos, lower implantation rates, or a higher risk of miscarriage.
By contrast, when women with PCOS / PMOS adopt a holistic, root-cause fertility approach, they not only improve their egg quality and overall well-being, but their partner's sperm quality often improves as well since I work with both members of the couple. This creates the healthiest foundation for conception.
The Bottom Line
Women with PCOS / PMOS often have plenty of eggs but may face challenges with how those eggs mature and their overall quality. By first assessing and then addressing insulin resistance, inflammation, and hormonal imbalances, the good news is that many women with PCOS / PMOS can improve egg health and increase their chances of conceiving.
I have personally helped many women with PCOS / PMOS—ranging from those who ovulate regularly to those who never ovulated—find success on their fertility journey. And despite having lean PCOS myself, I was able to have my first child in my late 30s and my second child in my 40s. These experiences give me a unique perspective and empathy when guiding my patients.
If you’re interested in working with a medical doctor who can provide guidance to help you conceive naturally and successfully with PCOS with PMOS, I encourage to schedule a Fertility Insight Session with me to start your personalized path toward natural, healthy fertility.
Please note that I serve patients in the San Francisco Bay Area and across California via telemedicine.
References
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