What is AFC?
Antral Follicle Count (AFC) is a fertility test that uses ultrasound to measure the number of small follicles within your ovaries.
Each of these fluid-filled follicles contains an immature egg. By counting them, AFC gives an indication of your ovarian reserve, helping to estimate how many eggs you may have remaining.
AFC is widely used to assess fertility potential and is often carried out alongside an Anti-Müllerian Hormone (AMH) test to provide a more complete picture.
AFC Ranges and Ovarian Ageing Benchmarks
AFC naturally declines with age, so your result is best understood in the context of your age group – rather than as a single number.
While every person is different, the ranges below offer a general guide to how AFC typically changes over time:
- Early 20s to early 30s: Higher follicle counts are expected, often reflecting a stronger ovarian reserve.
- Mid-30s: A gradual decline begins, with moderate counts becoming more common.
- Late 30s to early 40s: Lower follicle counts are typical as ovarian reserve reduces.
- Mid-40s and beyond: Follicle numbers are usually low, reflecting natural reproductive ageing.
These benchmarks can help give context to your results, but they are not a diagnosis. Fertility is influenced by a range of factors, and AFC is just one part of the overall picture.
What is AFC Testing: Preparation and Aftercare
Antral Follicle Count (AFC) is measured using a transvaginal ultrasound, which provides a clear view of your ovaries to assess the number of small follicles.
Before your scan
AFC is usually performed in the first 14 days of your cycle, in order to give the most accurate result. You may be asked to attend with an empty bladder and to share any relevant medications with your clinician.
During the scan
A small ultrasound probe is gently inserted into the vagina to examine your ovaries. The scan typically takes 10–15 minutes and is generally well tolerated.
After your scan
You can return to normal activities straight away. Results are often reviewed alongside other tests, such as AMH, to give a broader view of your fertility.
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Understanding Your AFC Results – AMH and AFC
Your Antral Follicle Count (AFC) is reported as the total number of follicles across both ovaries. This number helps indicate your ovarian reserve, but it is most useful when interpreted alongside other markers.
In general:
- Higher AFC: May indicate a higher ovarian reserve or conditions such as PCOS
- Average AFC: Suggests a typical ovarian reserve for your age
- Lower AFC: Indicates a reduced ovarian reserve
AFC results should always be viewed in context. A lower count does not mean pregnancy is impossible, and a higher count does not guarantee fertility.
To build a more accurate picture of ovarian reserve, AFC is often combined with Anti-Müllerian Hormone (AMH) testing.
- AFC provides a visual count of follicles through ultrasound
- AMH measures hormone levels linked to the number of follicles remaining
Together, these two markers are widely used to assess egg quantity and help guide fertility planning.
How AFC and AMH work together
| Marker |
How it’s measured |
What it shows |
Key benefit |
| AFC |
Transvaginal ultrasound |
Number of visible follicles in the ovaries |
Direct, visual assessment of egg supply |
| AMH |
Blood test |
Hormone levels produced by follicles |
Supports and validates AFC findings |
| Combined view |
Ultrasound + blood test |
Overall ovarian reserve |
More reliable, balanced assessment |
By combining AFC and AMH, clinicians can cross-check results and reduce the risk of relying on a single measure, helping to provide a clearer and more personalised understanding of your fertility.
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Understanding Low AFC and Diminished Ovarian Reserve
A lower-than-expected AFC can feel worrying, but it’s only one part of your fertility picture. It simply means fewer follicles are visible than typically expected for your age, and may be an indicator of diminished ovarian reserve.
Key things to keep in mind:
Pregnancy is still possible
Many women with low AFC or diminished ovarian reserve conceive naturally
Timing may matter more
A reduced ovarian reserve can mean a shorter fertility window
Treatment outcomes can vary
Fewer eggs may be collected during IVF, but success is still possible
It helps inform your next steps
Your results allow clinicians to recommend a treatment plan tailored to you.
AFC results are best understood in the context of other tests and your individual circumstances to build a clearer, more personalised view of your fertility.
High AFC and the Rotterdam Criteria for PCOS
A higher-than-average AFC can sometimes be linked to Polycystic Ovary Syndrome (PCOS), but it is not used as a standalone diagnosis.
Under the Rotterdam Criteria, one of the indicators of PCOS is the presence of a high number of follicles, typically defined as more than 12 follicles per ovary on ultrasound.
However, a diagnosis of PCOS requires at least two of the following:
- Irregular or absent ovulation
- Signs of elevated androgens (such as acne or excess hair growth)
- Polycystic ovarian appearance on ultrasound
A high AFC alone does not confirm PCOS, but it can be an important clinical sign that may prompt further investigation alongside your symptoms and hormone results.
The Biological Triad: How FSH and Estradiol Influence Your Count
AFC is closely linked to the Hypothalamic-Pituitary-Ovarian (HPO) axis, which controls how your ovaries function.
Two key hormones play a role:
- FSH (Follicle-Stimulating Hormone): Stimulates follicle growth. Higher levels can suggest the ovaries are working harder, which may indicate reduced ovarian reserve
- Estradiol: Produced by developing follicles. High levels early in the cycle can suppress FSH, potentially masking underlying issues
Why this matters
FSH and estradiol can affect how your AFC is interpreted. For example, normal FSH levels may not always reflect true ovarian reserve if estradiol is elevated.
Looking at AFC, FSH, and estradiol together provides a more accurate and balanced view of your fertility.
Why AFC Matters for IVF and Fertility Planning
AFC offers real-time insight into how your ovaries are functioning, and plays an important role in shaping fertility treatment.
How AFC is used in IVF
Your follicle count helps guide key decisions during controlled ovarian hyperstimulation:
- Medication dosing: Adjusted to suit your ovarian response
- Response prediction: Indicates how your ovaries may react to treatment
- Egg retrieval expectations: Helps estimate how many eggs may be collected
- Treatment planning: Supports a personalised approach
- PCOS identification: Higher counts may highlight underlying conditions
What AFC can’t tell you
- Egg quality
- Natural conception ability
- Exact chances of pregnancy
AFC is used alongside other tests, such as AMH and medical history, to build a clearer picture and guide your next steps.
Does AFC change over time?
Yes. AFC can vary slightly from cycle to cycle, but the overall trend is a gradual decline with age, reflecting changes in ovarian reserve. While AFC indicates egg quantity, it does not assess oocyte quality, which also plays a key role in fertility outcomes.
Is the AFC scan painful?
Most patients find it comfortable and similar to a routine transvaginal ultrasound. You may feel mild pressure, but it is generally well tolerated and does not require anaesthetic.
Can AFC predict my chances of pregnancy?
Not directly. AFC measures egg quantity rather than overall fertility or oocyte quality, both of which influence the likelihood of pregnancy. It is one part of a wider clinical assessment.
Should I have an AFC scan if I’m not trying yet?
Yes. An AFC scan can provide early insight into your ovarian reserve and support future planning. It may also be useful for those concerned about timelines or experiencing secondary infertility, helping guide when to seek further advice.
Take the Next Step
Understanding your AFC is a powerful step towards taking control of your fertility. At Concept Fertility Clinic, we combine advanced diagnostics with personalised, compassionate care – so you always know your options. You’ll receive clear, supportive guidance so you can move forward with confidence.
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