When you ask us “how many follicles does a woman have?”, what you are really asking about is your ovarian reserve: how many “recruitable” follicles we can see today and what we can expect from the ovaries at this point in your life. Spoiler: we never look at a single number. We assess ovarian reserve using AMH – Anti-Müllerian Hormone + Antral Follicle Count (AFC) and age — never an isolated figure. This way we avoid rushed decisions and give you a realistic plan to achieve pregnancy now or preserve your fertility for later.
What are ovarian follicles and how do they work?
Follicles are small fluid-filled “sacs” in the ovary that house the oocytes (eggs). Throughout life, we go through several stages:
- Primordial: the “stock” you are born with. They decrease naturally over the years.
- Antral: the ones we can see on an ultrasound scan at the start of the cycle (day 2–5). This AFC – Antral Follicle Count is key because it reflects the functional reserve available right now.
- Dominant: from the group of antral follicles visible at the start of the cycle, one grows and overtakes the rest, leading to ovulation in natural cycles. The remaining follicles undergo atresia and are lost.
In a natural cycle, many follicles compete and only one (sometimes two) reaches ovulation. In stimulated cycles (for example, IVF — In Vitro Fertilization), we use fertility medication so that several antral follicles grow at the same time, allowing us to retrieve more eggs in a single egg retrieval (pick-up).
Follicle vs oocyte: differences that matter
The follicle is the “house”; the egg is the cell we need for fertilisation. We can see the number and size of follicles on an ultrasound scan, but egg quality cannot be assessed by ultrasound. There are no tests that can tell us about quality before starting treatment either. Only by performing IVF — where we can observe how the embryos develop and even analyse them genetically — can we truly evaluate egg quality. What is clear, however, is that egg quality depends heavily on age: as the years go by, quality declines and the likelihood of aneuploid embryos (chromosomally abnormal) increases. We factor this into our strategy — for example, opting for fertility preservation as early as possible or recommending preimplantation genetic testing (PGT-A) in an IVF cycle.
From the antral group to the dominant follicle: the typical journey
On days 2–5, we count the antral follicles; then, with or without ovarian stimulation, they grow until one (or several, if we stimulate) reaches target size. The ultrasound scan allows us to track growth and, with experience, estimate response and adjust medication accordingly. In our day-to-day practice we see it like this: when the response is low, we adjust the medication and, if appropriate, add a second stimulation in the luteal phase to optimise the number of eggs in the shortest possible time.
How is ovarian reserve measured? (AFC + AMH + age)
To get your real picture we use three pieces:
- AFC – Antral Follicle Count: the total number of follicles visible on transvaginal ultrasound scan in both ovaries (usually day 2–5).
- AMH – Anti-Müllerian Hormone: a stable biomarker throughout the cycle that reflects the follicular population. In consultation, we always confirm it alongside the AFC. For us, AMH is the best analytical marker of reserve, but it must be interpreted together with the AFC and your age.
- Age: this is not “just a number”; it determines egg quality and, therefore, the probability of having euploid embryos (chromosomally normal).
On which day of the cycle do we count follicles?
We prefer days 2–5 for consistency and because antral follicles are easy to distinguish at that size. However, depending on availability we can assess them at any point in the cycle — several studies have shown that the AFC can also be performed in the second half of the cycle without losing predictive power for ovarian reserve evaluation. If you are taking contraceptives or other treatments, we note that to interpret the image correctly.
AMH: how to interpret your levels alongside the count
AMH is never looked at in isolation. It can be relatively preserved while the AFC is low (or the other way around). That is why we always triangulate: AMH + AFC + age. This combination guides whether we recommend trying for pregnancy, preserving your eggs, or proceeding with treatment (e.g. IVF) at the right time.
Would you like to understand what your follicle count means?
We can look at the count alongside your age, test results and reproductive goals.
How many follicles are “normal”?
Here we land on what concerns you most. We use indicative thresholds for the AFC to speak a common language:
- High reserve: >15 antral follicles.
- Normal/adequate reserve: from 10 onwards.
- Low reserve: <6.
Important: these are guide ranges; the final decision is made together with AMH and age. An AFC of 10 or above usually indicates adequate reserve; below 6, we individualise to the fullest.
Typical thresholds: high >15 / normal 10–15 / low <6
With an AFC >12 we usually anticipate a good response to ovarian stimulation (provided age is favourable). Between 6–10, we expect a moderate response and plan dosage and realistic goals. With <6, we flag a higher risk of poor response and consider strategies to accumulate eggs.
Indicative ranges by age (30, 35, 40)
- At 30: it is common to see an AFC around 10–15 (varies greatly from person to person).
- At 35: it usually sits near 6–10; here AMH becomes more important to refine the prognosis.
- At 40: we often see <6 and a greater impact on quality; we plan with clear timelines and expectations.
These ranges do not replace your personalised assessment. That is why we offer the Fertility Test: an ultrasound scan of your uterus, tubes, and ovaries + AFC + AMH blood test, and together with your age we define your best course of action.
“I have 3 follicles”: what it means and what your options are
Having 3 antral follicles causes a lot of anxiety, but it is not the end of the road. In cases of low reserve, the challenge is how to make the most of each egg:
- Natural cycle vs stimulated cycle: with 3 antral follicles, a natural cycle usually yields 1 ovulation; with mild stimulation we can try to rescue 2–3.
- IUI vs IVF: with a very low AFC and/or age >35, we usually prioritise IVF to retrieve the eggs and fertilise them in the laboratory, maximising options per cycle.
- Accumulation/double stimulation: If the response is low, we adjust the medication and, when appropriate, add a second cycle in the luteal phase. This allows us to accumulate eggs or embryos in less time before transferring or vitrifying.
How many follicles make a treatment viable?
The right question is: what is the probability of obtaining the eggs you need for your goal, given your AFC, AMH, and age?
- With an AFC of 6–10 and AMH in line, we usually see favourable viability for standard IVF.
- With an AFC <6, the risk of poor response increases; treatment is still viable, but we adapt expectations and strategy (e.g. individualised stimulation, mild stimulation protocols, load simulation, and accumulation).
- With an AFC >12, if age is favourable, viability is high; we monitor closely to prevent hyper-response.
We do not accept or rule anyone out based on a single number. We adjust doses, consider double stimulation, and discuss a Plan B (e.g. a second consecutive round in the luteal phase or postponing to another cycle).
What we look at: AFC + AMH + age + medical history
- AFC: how many antral follicles do we have to start with?
- AMH: how much “reserve pool” is left?
- Age: reflects quality and the risk of aneuploid embryos (chromosomally abnormal).
- Medical history: previous responses, ovarian surgery, endometriosis, etc.
Dose adjustment and double stimulation / luteal-phase cycle
In cases of poor response, we personalise the type of gonadotropin and dosage, consider adjuvants, and decide whether to accumulate eggs with back-to-back stimulations (follicular + luteal phase). The goal: maximise competent eggs in the shortest time, with the least physical and emotional toll.
Planning and preservation: when to vitrify
Knowing your reserve in time opens doors. Knowing your reserve in time gives you options: vitrify your eggs or bring your plan forward. If today you don’t want to or can’t try for pregnancy and your AFC/AMH are already on the low side (or you are ≥35), egg freezing (vitrification) can freeze the quality of your current eggs and give you the breathing room to decide calmly.
Benefits of deciding in time
- Greater probability of having eggs of better quality.
- Less rushing when the time comes.
- A clear plan: you will know whether it makes sense to try now, preserve, or combine both options.
Shall we talk?
We’re here to listen to your questions and help you understand the next steps.
Frequently asked questions
There is no “magic number”, but when we talk about a fertile ovary we usually mean a total AFC (both ovaries) of 10 or above with a matching AMH and an age that does not compromise quality. That combination is typically associated with a good prognosis.
As a guide: normal 10–15, low <6, high >15. What is “normal” is fine-tuned with AMH and age. Two women with an AFC of 8 can have very different prognoses if one is 31 and the other 39.
At 35, many women have around 10 antral follicles, although there is considerable variation. At this stage, AMH gives us context and age begins to weigh on quality. That is why, at this age, we usually talk about planning (trying soon or preserving).
It indicates low reserve. There are still options, but it is essential to individualise: careful stimulation, possible consecutive cycles to accumulate eggs or embryos, and considering IVF over intrauterine insemination (IUI) if age is ≥35 or other factors are at play. The key is not to waste time on protocols that do not maximise your chances.
The number of follicles is not a verdict — it is a data point within a context. We walk with you through AFC + AMH + age to decide together: try now, adjust treatment, or vitrify and plan ahead. Knowledge is power… and in fertility, timing makes all the difference.
