When discussing fertility, two terms come up frequently: egg quality and egg quantity. Both play important roles in your ability to conceive, but they measure different things and are affected by different factors. Many women understandably focus on one without fully understanding the other, which can lead to confusion when interpreting test results or making decisions about treatment.
This article explains what egg quality and quantity mean, how they're assessed, and what you can realistically do to optimise your fertility potential.
What Is Egg Quantity?
Egg quantity refers to the number of eggs remaining in your ovaries, often called your ovarian reserve. Women are born with all the eggs they will ever have, typically around one to two million at birth. By puberty, this number drops to approximately 300,000 to 400,000, and it continues to decline throughout your reproductive years.
Your ovarian reserve can be estimated using:
- AMH (Anti-Müllerian Hormone) blood test, measures a hormone produced by the cells surrounding your eggs. A higher AMH generally indicates more remaining eggs. Learn more about understanding your AMH level.
- Antral follicle count (AFC), an ultrasound scan that counts the small follicles visible in your ovaries at the start of your cycle.
These tests tell us roughly how many eggs are available for stimulation in treatments like IVF, but they don't tell us anything about the quality of those eggs.
What Is Egg Quality?
Egg quality refers to whether an egg has the correct number of chromosomes and enough energy to develop into a healthy embryo after fertilisation. A high-quality egg is more likely to fertilise successfully, implant in the uterus, and result in a healthy pregnancy.
Unfortunately, egg quality cannot be measured directly through blood tests or scans. The only way to assess it is by observing how eggs perform during IVF, specifically, how well they fertilise, divide, and develop into embryos.
The most significant factor affecting egg quality is age. As women get older, a higher proportion of eggs carry chromosomal abnormalities. This is why the chance of conception decreases and the risk of miscarriage increases with age, not simply because there are fewer eggs, but because fewer of the remaining eggs are chromosomally normal. You can read more about how age affects fertility.
Comparing Egg Quality and Quantity
| Factor | Egg Quantity | Egg Quality |
|---|---|---|
| What it measures | Number of eggs remaining | Chromosomal health and developmental potential |
| How it's assessed | AMH blood test, antral follicle count | Cannot be directly tested; inferred from embryo development |
| Primary influence | Individual variation, some medical conditions | Age |
| Can it be improved? | No, egg supply only decreases over time | Limited evidence; age is the dominant factor |
Why Both Matter, But in Different Ways
Having a good ovarian reserve means you may respond well to fertility medications and produce multiple eggs during an IVF cycle. However, if many of those eggs are chromosomally abnormal, the chance of a successful pregnancy may still be lower than expected.
Conversely, a woman with fewer eggs but good egg quality may have excellent success rates. This is why younger women with low AMH often have better outcomes than older women with normal AMH, age remains the strongest predictor of egg quality.
It's also worth noting that a low AMH doesn't mean you cannot conceive naturally. It may mean fewer eggs are available if you pursue assisted reproduction, but it doesn't rule out pregnancy altogether.
Can You Improve Egg Quality?
This is one of the most common questions in fertility care. The honest answer is that there's no proven way to reverse the natural decline in egg quality that comes with age. However, there are general health measures that may support your reproductive system:
- Avoid smoking, smoking is linked to accelerated ovarian ageing and poorer egg quality.
- Maintain a healthy weight, both underweight and overweight can affect ovulation and hormonal balance.
- Limit alcohol, excessive alcohol consumption may affect fertility outcomes.
- Manage chronic conditions, conditions like endometriosis or PCOS may benefit from treatment that supports overall reproductive health.
Some supplements, such as CoQ10 and DHEA, have been studied for their potential effects on egg quality, but evidence remains limited. If you're considering supplements, it's worth discussing them with a fertility specialist to understand whether they're appropriate for your situation.
Frequently Asked Questions
Can I have good egg quality but low egg quantity?
Yes. A younger woman with low AMH may still have good-quality eggs. Age is the primary determinant of egg quality, while AMH reflects quantity.
Does a normal AMH mean I'll have no trouble conceiving?
Not necessarily. AMH tells us about egg supply, not quality or other fertility factors. A full fertility assessment considers multiple elements.
At what age does egg quality start to decline?
Egg quality begins to decline gradually from the early 30s and more noticeably after 35, with a sharper drop after 40.
Should I freeze my eggs if I'm concerned about quality?
Egg freezing preserves eggs at their current quality. If you're considering this option, earlier is generally better. A specialist can help you weigh the benefits and limitations.
Want to Understand Your Fertility Better?
If you have questions about your egg quality, AMH results, or what they mean for your fertility journey, a consultation can help clarify your options.
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