When you have a result from a follicle tracking scan, it can feel overwhelming as you try to figure out what that number actually means for your cycle. If you’re wondering what’s considered ‘normal’ for IVF treatment options, the most reassuring thing to know is that there is no magic target you have to hit. Generally speaking, we aim to see between four and ten larger follicles at the time of your “stim” scan, with the number varying based on your age, AMH level and body weight, along with an antral follicle count.All of these factors influence the treatment regimen your Surfcoast fertility specialist will prescribe.
What Follicles are and why They Matter for IVF
How Many Follicles are Normal?
Understanding Your Normal Antral Follicle Count (AFC)
How Many Follicles do You Need for IVF?
Factors That May Affect Your Follicle Count
Common AFC Questions Answered
Talk Through Your IVF Options With Surfcoast Fertility
Key Takeaways
- There is no single ‘normal’ follicle count; Your response is read alongside age, hormones and AMH level
- A follicle is a fluid filled sac that may hold an egg, so follicle and collected egg numbers often differ, and quality matters as much as quantity.
- During IVF, ovarian stimulation medication grows several follicles at once, monitored by ultrasound until they mature, then following a trigger injection, eggs are collected at retrieval.
- Follicle numbers can be affected by age, PMOS, previous surgery and body weight (BMI); IVF may still be an option with a AMH or antral follicle count, and Surfcoast Fertility Specialists are here to talk through your options.
What Follicles are and Why They Matter for IVF
Follicles are fluid-filled sacs inside the ovaries, and each one holds an immature egg. During in vitro fertilisation, Ovarian stimulation medication encourages several follicles to grow so that more than one egg may be collected. At the time of the follicle scan, (often called the “stim” scan),there always is a range of follicle sizes present. Follicles grow about 2mm per day, and eggs can be retrieved from follicles more than 14mm in size.
Eggs are removed from these follicles within the ovary during the retrieval step.
A follicle is not the same as an egg. A follicle is the sac; the egg is what may sit inside it. Not every follicle contains a mature egg, which is one reason your follicle count and your final egg number can differ.
How Many Follicles are Normal?
There is no universal ‘normal,’ because a healthy follicle count depends heavily on age and individual biology. As a general guide, the total antral follicle count, which is measured before ovarian stimulation, across both ovaries falls somewhere around eight to fifteen in total.
Counts tend to decline gradually with age, as do AMH levels. What matters just as much as the number is egg quality.
A modest count of good-quality eggs may lead to a strong outcome, while a very high count does not guarantee success. Your fertility team works carefully to get six to eight large follicles from each ovary.
Understanding Your Normal Antral Follicle Count (AFC)
Your normal antral follicle count (AFC) is the number of small resting follicles seen on a transvaginal ultrasound, usually early in your cycle.
This is assessed with your AMH blood test, and age to give an estimate of your ovarian reserve, which is the pool of eggs you have available. So an ultrasound of the ovaries, paired with blood tests, helps predict how the ovaries respond to fertility medication.
The table below is a general guide only, and ranges vary between clinics and individuals.
| Antral follicle count (both ovaries) | What it may suggest |
|---|---|
| Below 5 to 7 | May indicate a lower ovarian reserve |
| 8 to 15 | Often considered a normal antral follicle count |
| 16 to 20 or more | A stronger reserve that may increase the risk of ovarian hyperstimulation |
| Very high, with many small follicles | May be associated with polycystic metabolic ovarian syndrome (PCOS) |
Your AFC is a snapshot, not a verdict. It is best understood alongside your AMH results and other ovarian reserve testing.
How Many Follicles Do You Need for IVF?
You do not need a large number of follicles for an IVF cycle to be successful. More follicles may mean more eggs, and more eggs may mean more embryos to choose from. Quality, however, still leads the way. We always consider safety of treatment when planning your treatment regimen; excessive follicle number can place you at risk of Ovarian hyperstimulation Syndrome
A landmark analysis of more than 400,000 cycles found that live birth rates rose as the number of eggs collected increased up to around fifteen, then levelled off between fifteen and twenty, and declined beyond twenty. In other words, more is not always better, and a middle range is often the goal.
What Happens to Your Follicles During IVF Treatment
During an IVF cycle, fertility medication stimulates your ovaries so that multiple follicles grow at once, rather than the single follicle that a natural cycle usually matures.
Your team monitors their number and size closely, then times the next step accordingly. Here is the general path your follicles follow:
- Baseline scan: Your antral follicles are counted during your initial fertility assessment, well before stimulation begins.
- Stimulation: Daily medication encourages several follicles to grow together.
- Monitoring: Ultrasound scans and blood tests track growth, which is often around two millimetres per day.
- Trigger: When enough follicles reach maturity, generally around 14 to 22 millimetres, a trigger injection matures the eggs, and changes the hormone production in the ovary from oestrogen to Progesterone.
- Retrieval: Mature eggs are collected from the follicles about 36 hours later.
‘The goal of stimulation isn’t to rush the process, but to carefully nurture a cohort of eggs together. Close monitoring helps us fine-tune your treatment ensuring the best possible outcomes in terms of egg quality and number.”
– Dr Russell Dalton, Medical Director
Factors That May Affect Your Follicle Count and Ovarian Reserve
Several factors may influence how many follicles you have and how they respond to treatment. Age is the strongest single factor, but it is not the only one. Common influences include:
- Age and natural ovarian reserve
- Conditions such as PMOS or endometriosis
- Previous ovarian surgery
- Certain medical treatments, including chemotherapy
- Lifestyle factors such as smoking
Common AFC Questions Answered
Does three follicles mean three eggs?
Not necessarily. A follicle is a fluid-filled sac that may hold an egg, but not every follicle contains a mature egg at retrieval. Three follicles may yield three eggs, fewer, or occasionally none.
How many follicles should a 35-year-old woman have?
There is no set number, but many women around this age have an antral follicle count somewhere in the region of 8 to 15 across both ovaries. Counts naturally decline with age, and your fertility team reads the number alongside your hormones and history rather than on its own.
How can I increase my follicle count?
You cannot create new follicles, as your ovarian reserve is largely set, but general health steps may support the follicles you have.
These may include not smoking, maintaining a healthy weight, managing conditions such as PCOS, and following your medication plan during treatment.
Is it possible to do IVF with a low follicle count?
Yes, IVF may still be an option with a low count. Your team may adjust your medication or protocol, and even a small number of good-quality eggs may lead to a healthy embryo.
Can follicle count change from month to month?
Yes, your antral follicle count may vary slightly between cycles. This is normal, which is why health professionals consider it alongside your age, hormones and overall history.
Talk Through Your IVF Options With our Surfcoast Fertility Specialists
Follicle counts rise and fall with age and health; in general, quality often outweighs quantity. Whatever your ovarian reserve is, assessed by AFC or AMH, either it needs to be read in full context by someone who knows your entire history, not just against someone the same age.
At Surfcoast Fertility, our team takes the time to explain what your follicle count and ovarian reserve means for you and to talk through your IVF treatment options with care.
