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Follicular Tracking Scan (Transvaginal Scan)

At International Ultrasound Services in London, we provide expert follicular tracking and antral follicle count scans, ensuring precision and care at every stage.

If you're seeking insights into your ovulation cycle, timing for artificial insemination, or preparing for IVF treatment, our ultrasound clinic in  London is ready to support and assist you with a a team of dedicated healthcare professionals and state of the art ultrasound technology.

Follicle tracking and antral follicle count (AFC) are related but distinct fertility assessment techniques: the follicle tracking monitors follicle development over a cycle (performed from day 10 of your menstrual cycle), while the antral follicle count provides a snapshot of the ovarian reserve at a specific point in time (performed between day 2 and day 4 of your menstrual cycle).

Both are valuable tools in the assessment and management of fertility.

Key features of the follicle scan

  • Fertility assessment Scan
  • Antral follicle count (AFC)
  • Assess Endometrial Thickness and lining
  • Assess Follicular growth and Ovulation
  • Assess uterus and endometrium
  • Transvaginal Ultrasound Scan
  • No GP referral is required
  • Same time results to take away
  • Fully qualified, experienced NHS sonographers
  • No preparation is required.
  • Same-day appointments are usually available.
  • Price: Only £149
  • Book Online or over the phone
A woan is having a follicular tracking scan in London

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What is a Follicle Tracking Scan?

A Follicle Tracking Scan, also known as an ovulation scan, is an ultrasound scan that is done during the menstrual cycle to track the development of ovarian follicles. It allows doctors to monitor the growth of follicles and identify when ovulation will occur.

Some key points about Follicle Tracking Scans:

  • They are typically performed starting a few days after a woman's period ends, and continuing every 2-3 days until ovulation is detected. The scans allow the doctor to see the follicles developing and measure their size.
  • The scans track the dominant follicle, which is the follicle that will eventually rupture and release the egg at ovulation. The dominant follicle grows to around 20mm before ovulation.
  • When the dominant follicle reaches around 18-20mm, ovulation is close. Usually ovulation occurs within 24-48 hours after the follicle reaches this size.
  • The scans help pinpoint the day of ovulation so that the timing of intercourse or insemination can be planned appropriately, which improves the chances of conception.
  • They are commonly used by fertility specialists to time intrauterine insemination (IUI) or in vitro fertilization (IVF) cycles. They are also sometimes used by women trying to conceive naturally.
  • The scans are done transvaginally, with a probe inserted in the vagina. This allows clearer images of the ovaries and follicles.

Follicle Tracking Scans use ultrasound to provide important information about the development of follicles in the ovaries, enabling ovulation to be precisely timed. This optimizes chances for conception.

What is the antral follicle count scan?

The Antral Follicle Count (AFC) scan is an ultrasound scan used to count  the total number of follicles, each measuring between 2 to 8 mm, in both the right and left ovaries. It is a significant biological marker used in various reproductive contexts.

In controlled ovarian hyperstimulation/intrauterine insemination programs, AFC is used to predict pregnancy outcomes (Chang et al., 2004).

It's also a marker of ovarian reserve and is used to evaluate the proportion of follicles responsive to exogenous follicle stimulating hormone (FSH) during controlled ovarian stimulation (Bessow et al., 2019).

Additionally, AFC is utilized in assessing ovarian function in various populations, including breast cancer survivors, where it provides data independent of other hormonal markers (Su et al., 2009). In in vitro fertilization (IVF), AFC predicts the number of retrieved oocytes and the likelihood of success, although its ability to predict embryo quality or pregnancy is less clear (Silva et al., 2014). AFC is also a critical component in the selection of bovine females for biotechnology, where it correlates with various fertility parameters (Morotti et al., 2017).

AFC is a valuable diagnostic tool in reproductive medicine and biotechnology, used for predicting outcomes in various treatments and assessing ovarian reserve and function.

When is the best time in my cycle to have the follicular monitoring scan?

The follicular study is ideally conducted in the first half of your menstrual cycle, often commencing from day 10. The exact timing can differ based on your individual cycle and any specific fertility treatments you might be undergoing.

When is my cycle's best time for the Antral Follicle Count scan?

AFC scans are typically performed between the 2nd and 4th day of the menstrual cycle (Chougle et al., 2008). This timing is chosen to assess the ovarian reserve at a stage when the influence of hormonal variations is minimal.

AFC should be performed within 3 months of a spontaneous menstrual cycle for infertility work-up (Nardo et al., 2007).

What is the cost of the follicle tracking scan in London?

The cost of the follicle tracking scan in our clinic in London is £149.

What is included?

The imaging tests include a digital diagnostic ultrasound report and, if needed, images and a follow-up recommendation.

What are the Benefits of Follicle Tracking Scan?

  • Pinpoint ovulation timing - The scans allow ovulation to be identified within a 24-48 hour window, enabling precise timing of intercourse or insemination. This maximizes chances of conception.
  • Monitor follicle development - Track the growth and maturation of follicles. This allows doctors to determine if follicles are developing normally and time ovulation appropriately.
  • Guide fertility treatments - Scans are used to time intrauterine insemination (IUI), in vitro fertilization (IVF) egg retrieval, and monitor ovarian response to fertility drugs. This information helps optimize treatment.
  • Reduce missed ovulation - Scans catch the LH surge and ovulation, which can otherwise be easily missed. This prevents mistimed intercourse.
  • Identify reproductive issues - Abnormal scans can indicate problems like ovarian cysts or irregular ovulation patterns. Early identification allows quicker treatment.
  • Non-invasive - Transvaginal ultrasound scans are non-invasive and do not have any major risks or side effects associated with them.
  • Avoid mistimed intercourse - Scans pinpoint the most fertile days for intercourse, avoiding exhaustion from mistimed intercourse.

Overall, follicle tracking provides valuable information to maximize chances of natural conception or guide fertility treatments. The scans give insight into follicular development and precisely identify the critical ovulation period.

What are the Risks of Follicle Tracking Scan?

Follicle tracking scans done transvaginally are considered very safe procedures with minimal risks. However, here are some potential risks to be aware of:

  • Discomfort - The transvaginal probe can cause some discomfort during the exam. 
  • Inconclusive results - In some cases, the scans may not provide a clear picture of follicle growth due to the position of the ovaries or other factors. Results may be ambiguous.
  • User-dependent - Success of the scans depends on the operatpr's skill. An inexperienced ultrasonographer may not capture or interpret the images accurately..
  • Psychological stress - Some women can find the frequent scans emotionally stressful, especially if they show disappointing results. 

Overall, in the hands of an experienced professional, follicle tracking scans are very safe and well-tolerated. They provide significant benefits for fertility treatment with minimal risks. 

Book your Follicle Tracking Scan Online

Use our online booking system to choose the most suitable day and time.

Only £149

(£29 deposit is required)

Preparation for the Scan

Ensuring that you are adequately prepared for your Follicle Tracking Scan is paramount to obtaining the most accurate results. Here's a step-by-step guide to help you get ready for the procedure:

Timing: The Follicle Tracking Scan is typically conducted during the first half of your menstrual cycle, often commencing from day 10. However, the exact day might vary based on your individual cycle's length and regularity. It's advisable to consult with our sonographers regarding the best starting day tailored to your cycle.

Dietary and Medicinal Intake: There are no specific dietary or medicinal restrictions leading up to the scan. Continue with your regular meals and medications unless otherwise advised by your healthcare provider.

Clothing: On the day of the scan, opt for loose and comfortable clothing, preferably a two-piece outfit. This ensures ease during the procedure, given that the scan is typically performed transvaginally.

Bladder: As the scan provides a clearer view of the ovaries when performed transvaginally, it's recommended to empty your bladder before the procedure. This not only ensures optimal imaging but also enhances your comfort during the scan.

Communication: If you have any specific concerns, allergies, or medical conditions that might affect the scan, please inform our team in advance. Open communication ensures that we can make any necessary accommodations for your safety and comfort.

Relaxation: It's natural to feel a bit anxious, especially if it's your first time undergoing such a scan. We encourage you to arrive a few minutes early, allowing yourself time to relax and familiarize yourself with the environment. Our team is here to answer any questions and alleviate any concerns you might have.

Remember, our primary goal at International Ultrasound Services is to provide you with a seamless and stress-free experience. Your comfort, safety, and well-being are our top priorities, and we are committed to ensuring that you are well-informed and prepared for your scan.

The Procedure

At International Ultrasound Services, we understand that any medical procedure can be a source of anxiety. That's why we believe in explaining our process transparently, helping you know what to expect when you come in for a follicle tracking ultrasound scan.

On the day of your scan, you'll be welcomed into our comfortable, private scanning rooms by one of our experienced sonographers. We recommend wearing comfortable clothing and a two-piece outfit as the scan is typically performed transvaginally to get the best images.

The sonographer will first explain the procedure and answer any questions you may have. When you're ready, you'll be asked to lie down on the examination table.

A small, slim ultrasound probe, covered with a disposable protective sheath and a small amount of gel for ease of movement, will be gently inserted into the vagina.

The sonographer will then take multiple images of your ovaries. The procedure is typically painless, although you may feel a slight pressure. It usually takes about 5-10 minutes, during which our sonographer will track the development of the follicles in your ovaries.

Rest assured that our team is trained to prioritize your comfort and dignity throughout the procedure.

If you feel any discomfort or need to take a break, you can communicate this to the sonographer at any time.

Understanding the Results

After your scan, our sonographer will interpret the images captured during your follicle tracking ultrasound. The main focus will be on the number, size, and development stage of the follicles within your ovaries.

We understand that waiting for results can be stressful, so we aim to provide immediate verbal results whenever possible. In some cases, a more in-depth analysis may be required, and we will provide a full, detailed report within 30 mins to an hour.

The results of the scan can help determine the best time for natural conception or in vitro fertilization (IVF) treatment.

They can also provide insights into conditions that may be affecting your fertility, such as Polycystic Ovary Syndrome (PCOS).

If the results indicate that there may be an issue with your fertility, our sonographers will explain these findings in a sensitive and clear manner. We understand that this can be a delicate topic, and we're committed to providing supportive care every step of the way.

Following the scan, you'll have the opportunity to discuss your results with our sonographer or your referring healthcare professional. They can explain what the results mean for you and the potential next steps in your fertility journey, whether that's further testing, treatment, or another cycle of tracking.

At International Ultrasound Services, we believe in empowering you with information. Our goal is to provide clear, understandable results that can help guide your decisions and give you confidence in your fertility care.

Benefits of Choosing International Ultrasound Services

At International Ultrasound Services, we are committed to providing the highest level of care for all our patients. Our clinic is known for its expertise in follicle tracking scans, backed by years of experience and thousands of successful procedures. Here are some reasons why patients choose us:

  • Experienced Staff: Our team of sonographers are highly trained and have extensive experience in conducting and interpreting follicle tracking scans. Their skill and dedication ensure precise and reliable results.
  • Advanced Technology: We use the latest ultrasound technology, which allows us to provide detailed and accurate scans. This technology aids in the careful tracking and monitoring of your follicles' development.
  • Comfortable Environment: We understand that your comfort matters. Our clinic is designed to provide a calm, welcoming environment. We ensure your privacy and dignity are maintained throughout the procedure.
  • Personalized Care: Every patient is unique, and so is every fertility journey. We take the time to understand your individual needs and concerns, tailoring our services to provide the best care possible.
  • Convenient Location: Conveniently located in the heart of London, our clinic is easily accessible by public transport, making your visit as hassle-free as possible.


We understand you may have many questions about follicle tracking scans. Below, we've addressed some of the most common queries:

What exactly does a Follicle Tracking Scan monitor?

A Follicle monitoring Scan is a specialized ultrasound that observes the growth, number, and maturation of follicles within the ovaries. These follicles contain eggs, and their development is crucial for understanding ovulation timing and overall fertility status.

Is the procedure painful?

Most patients find the scan to be quite comfortable. While there might be a sensation of slight pressure during the transvaginal procedure, it is generally not described as painful. Our team always prioritizes patient comfort throughout the entire process.

How long does the follicular scan take?

The duration of the scan typically ranges between 5-10 minutes. However, individual circumstances might cause slight variations in the time taken.

When is the best time in my cycle to have the follicular monitoring scan?

The follicular study is ideally conducted in the first half of your menstrual cycle, often commencing from day 10. The exact timing can differ based on your individual cycle and any specific fertility treatments you might be undergoing.

When is the best time to have the Antral Follicle Count scan in my cycle?

AFC scans are typically performed on the 2nd day of the menstrual cycle (Chougle et al., 2008). This timing is chosen to assess the ovarian reserve at a stage when the influence of hormonal variations is minimal.

AFC should be performed within 3 months of a spontaneous menstrual cycle for infertility work-up (Nardo et al., 2007).

Can this scan diagnose other fertility issues?

While its primary purpose is to monitor follicle development, the scan can sometimes indicate other conditions that might affect fertility, such as Polycystic Ovary Syndrome (PCOS). For a comprehensive diagnosis, it's always best to consult with a fertility specialist.

How soon will I receive the results?

We strive to provide immediate verbal feedback after the scan. When a more detailed analysis is necessary, a comprehensive written report will be made available within 24 hours.

Do I need a doctor's referral to book a private ultrasound scan at your clinic?

No doctor's referral is necessary. You can directly book an appointment with us, either through our online platform or by calling us.

Are there any preparations required before the scan?

No specific dietary or medicinal preparations are mandatory. Since the scan is frequently performed transvaginally, we advise patients to empty their bladder before the procedure. It's also beneficial to wear comfortable attire to ensure a smooth experience.

If you have more specific or detailed questions, our dedicated team at International Ultrasound Services is always on hand to provide further information and support.

We're committed to ensuring you're well-informed and comfortable throughout your fertility journey.


Other Ultrasound Scans for Women we offer:

We offer a large selection of ultrasound scans for women in London.