Fertility Insights

3 June 2026

What Are Follicles And Why Are They Important For My Fertility?

What are ovarian follicles?

Ovarian follicles are small sacs filled with fluid that are found inside a woman’s ovaries. They secrete hormones which influence stages of the menstrual cycle and women begin puberty with about 300,000 to 400,000 of them. Each has the potential to release an egg for fertilisation. Follicles and their size and status are a vital part of assessing fertility and fertility treatment.

An evaluation of follicles involves a pelvic ultrasound scan of your womb and ovaries as well as an Anti-Mullerian Hormone blood test. The pelvic ultrasound scan will assess the size and number of follicles present on your ovaries called an Antral Follicle Count. The results of this scan as well as your blood test will allow a fertility specialist to assess your fertility and therefore your ability to conceive.

How may eggs will there be in a follicle?

In a normal menstrual cycle one follicle will grow containing one egg. The follicle will get bigger until it ruptures at ovulation which then releases the egg. This is usually around 14 days after the beginning of your menstrual cycle.

Will all follicles release an egg?

Usually, yes. In most cases follicles will release an egg. However, whether the egg is mature enough or is of good enough quality for fertilisation is another matter.

How many follicles is normal?

This is relevant to the woman’s age, general health, and lifestyle. However, more follicles do not necessarily guarantee successful fertilisation. The quality of the eggs is key and many women with fewer follicles can still conceive successfully with IVF because of the quality of the eggs.

How many follicles are left at 30?

The quality and quantity of a woman’s eggs is affected by her age as well as other health and lifestyle issues. The number of ovarian follicles a woman has does decline with age and so does the quality of her eggs. After the age of 35 however, a woman’s fertility starts to decline significantly, and by her early to mid-forties the chances of achieving a successful pregnancy are slim.

How do follicles relate to my chances of having a baby?

There are two main factors to consider when it comes to female virility:

Egg Quality
Follicle Count

The number of follicles present within your ovaries will tell a fertility specialist about the state of your fertility. This is because follicles contain immature eggs. These immature eggs develop and grow in size until the follicle they are held in is of optimum size, whereupon they are released (ovulation). If you have lots of follicles, then you have the potential to release more eggs increasing the chance that one of those eggs will be healthy enough to result in a successful pregnancy.

Egg quality is determined by your age and also your lifestyle. As a woman get older, the quality of eggs decreases, particularly after the age of 35, and normally from around her mid-40s most women will not be able to conceive naturally. Unfortunately, it is not possible to test the quality of your eggs.

If you are keen to understand your chances of having a baby, we would suggest a Fertility MOT.

Why happens to my follicles during IVF?

During IVF, you will be put on a course of drugs to stimulate your ovaries to produce more eggs. Monitoring the ovarian follicles is part of the fertility treatment process. You will have several pelvic ultrasound scans during the stimulation phase to assess that the dosage of medication is correct and when you are ready for or egg collection. This includes monitoring the number and size of the follicles on each ovary.

When your follicles have reached around 18-20mm in diameter they are deemed ready for egg collection. You’ll be given a hormone trigger injection to stimulate your follicles to release the mature eggs that have been prepared in your follicles. We will time your egg collection procedure around 36 hours after your trigger injection to allow us to collect your eggs at the best possible time. The mature eggs that are collected will then be transferred to the laboratory to be fertilised with sperm to create embryos.

Can my follicles be affected by IVF?

Ovarian Hyperstimulation Syndrome may occur if the ovaries are very sensitive to stimulation and produce an unusually large number of follicles and therefore eggs (usually more than 15) or high levels of oestradiol. This is a potentially dangerous situation, although OHSS, in its severe form, occurs in only 0.5% of patients. During the simulation phase of your treatment cycle, your follicles will be closely monitored by ultrasound scans. If we think you are at risk of developing severe OHSS, there are a number of options that you and your fertility specialist will need to consider including abandoning the cycle, delaying the egg collection, or freezing all the embryos for transfer in a later cycle.

What is Polycystic Ovarian Syndrome?

Polycystic ovarian syndrome (PCOS) is a condition which affects how the ovaries work. It usually means cysts can be seen on the ovaries or high levels of (male) hormones in the body can prevent the ovary from releasing an egg.

PCOS is very common and can affect up to one in every five women. Symptoms of PCOS can include irregular or no periods, difficulty getting pregnant, hair growth, weight gain and acne. Although PCOS cannot be cured it can be treated by losing weight or through medication. If you are trying for a baby, there are many options to help you to conceive including medication, Intrauterine Insemination (IUI) or IVF. In most cases women with PCOS can get pregnant.

More questions about your own fertility?

If you’re curious about your fertility or want to find out where you are in terms of your overall chances to conceive, why not book a female Fertility MOT with us now. It’s as easy as using our form or calling us on 020 7563 4309.

All of our blog posts are written, edited, or produced by the London Women's Clinic Content Team. This is a collaboration between our expert writers, health editors, and the leading researchers and senior doctors at our Harley Street clinic.

‘We started our IVF process with LWC around a year ago. It felt very daunting and a long road ahead, and the entire team were so supportive and explained everything so clearly. When we were undergoing the egg retreival and transfer, the team were so kind and we felt really looked after. We have now welcomed our little girl and after years of trying, we wouldn't have gotten here without the support and guidance given by LWC. Thank you all!’

Alice Maker

22 January 2026, LWC London Bridge

‘Dr Suraya made our appointment a really enjoyable experience. She made us both feel at ease and was so knowledgeable throughout the scan. Dr Suraya is a real asset to LWC’

Liz Troup

22 January 2026, LWC London Bridge

‘I received excellent care from all the staff at London Women's Clinic, we felt very welcomed as a same sex couple. We are so grateful to have been able to have our wonderful daughter. I would definitely recommend the clinic to anyone starting fertility treatment!’

Megan Knox

21 January 2026, LWC Canterbury

‘I've recently completed a round of egg freezing with London Women's Clinic harrow and I couldn't recommend them as a clinic more. Carla and Ana-Maria quite literally held my hand throughout the entire process, making me feel really relaxed and supported. It's made such a stressful experience super positive and if anyone is thinking of using them, I'd absolutely recommend them!’

Brooke Day

19 January 2026, LWC Harrow

‘I undertook Kind IVF, which even though is nurse led as opposed to consultant led, the care, professionalism and knowledge is there. The nurses consult with consultants during your protocol, so the difference really is you see the nurses instead. The medication doses are less and less medication, but this doesn't mean it will be less effective, it is an option worth exploring, as the cost is less and can open the door when more traditional ivf is out of reach. I am currently pregnant having gone through the kind ivf protocol one time.’

APINTOF MEGAN

19 January 2026, LWC London Bridge

‘Exceptional service from start to finish. Highly recommend Harley street team for looking after us. Absolutely loved your service and care. Thank you London woman's clinic :)’

Anh Nguyen

19 January 2026, LWC Harley Street

‘The team at the Cambridge LWC branch have been incredibly supportive, encouraging and helpful throughout our journey, and have been with us through the ups and downs. It's a very safe and inclusive space, and we feel very well cared for. We can't recommend them enough! Sarah and Jacqui’

Sarah Peace

16 January 2026, LWC Cambridge

‘We will be forever grateful to London Women's Clinic Bromley for helping us achieve what once felt impossible -- welcoming our beautiful, healthy baby boy in November 2025. Our IVF journey was emotional, overwhelming at times, and deeply personal, but from the very first appointment we were met with nothing but kindness, compassion, and unwavering support. Every step was clearly explained, we were kept fully informed throughout, and there was always someone available to answer our questions or simply reassure us when we needed it most. We never once felt like just another patient -- we felt truly cared for. Dr Malini, Sarah, Nicky (Nikita) and Dom were exceptional and will always hold a very special place in our hearts. Their warmth, patience, and genuine kindness made the process so much easier to cope with. They made us feel safe, comfortable, and supported during some of the most vulnerable moments of our lives. Every nurse, embryologist, and member of staff we encountered was wonderful. We honestly cannot recommend London Women's Clinic Bromley enough to anyone struggling with fertility or facing similar challenges. The dedication, empathy, and expertise of this team has changed our lives forever. We hope to take the clinic up on their offer to visit with our little miracle, who we are endlessly thankful they helped bring into this world. Thank you from the bottom of our hearts. Lucy & Sayed ’

Lucy morgan

16 January 2026, LWC Bromley

‘My journey with egg freezing in the LWC has been amazing. I had started consultations with another provider before but didn't feel comfortable there, and I'm SO GLAD I listened to my instinct and went to this clinic! The whole team was so knowledgeable and supportive throughout, but also just lovely. I would recommend the clinic, ESPECIALLY if you are worried about the process and feel emotional, the understanding and support here is way beyond what I was hoping for!!!’

Charlotte M

15 January 2026, LWC London Bridge

‘My journey with the LWC in London Bridge + Harley Street has been outstanding. The team is so lovely, I felt welcomed and understood from the first to the last call and through every appointment in between. I would recommend it to every friend!’

Charlotte M

15 January 2026, LWC Harley Street

‘Nicki has a beautiful and excellent personality, she was so kind, polite and sweet. I felt so happy after the scan . Bless her. Right woman for the job.’

Steave Oyinloye

15 January 2026, LWC Bromley

‘Nikita was fab - really put me at ease with my scan and able to relax. Feel very supported’

S S

15 January 2026, LWC Bromley

‘Just had my scan with Nikki and she was very informative and made me feel very comfortable.’

Lisa

15 January 2026, LWC Bromley

‘Nikita was excellent and mindful during our initial scan/consultation explained everything well.’

james harris

15 January 2026, LWC Bromley

‘Myself and partner have had a lovely experience with LWC Canterbury they are thoughtful and caring. Always made us feel comfort and welcome even through the difficulties that we have faced on our journey, however we will be forever grateful for all they have done and are contiuing to do.’

Natasha Elliott

14 January 2026, LWC Canterbury

‘This was my first fertility treatment, and I cannot express enough how thankful I am to have chosen LWC and to have been treated at the Harrow clinic. I would highly recommend it to anyone considering starting their fertility journey! From the start, I appreciated how transparent the admin team was about all the costs involved at every stage, giving clear ranges when the decision depended on how the treatment would go. I am also extremely grateful for their support in helping with securing financing, even when I decided to move forward at short notice. They took the time to schedule calls to answer my questions, and I truly felt listened to and cared for as a patient. At the Harrow clinic, I experienced an exceptionally caring and positive environment. All the nurses were highly professional while also being incredibly comforting and supportive. I would especially like to thank Ana Maria, who was there throughout the process, offering practical advice based on her own experience, a hug when needed, and making the entire journey feel much more like home. I would also like to thank Carla for her positivity, high energy, and encouragement during difficult moments, and Laura for her empowering and reassuring approach to the injections. Dr Goswami was also outstanding--extremely professional and clear in her advice. She carefully adjusted the treatment to aim for the best possible outcome while prioritising safety and minimising risks. I am also very grateful for the support groups organised by the clinic. Through these, I met incredibly brave and empowered women and couples. Sharing this journey with some of them made the experience far more bearable and positive. Thank you to everyone at the Harrow clinic and LWC for your incredible support!!’

Marina Riabiz

14 January 2026, LWC Harrow

‘We had a very positive experience at this IVF clinic and would highly recommend it. From the very beginning, we felt well supported and looked after throughout the entire journey. A special thank you to Safak, our patient coordinator, who was incredibly helpful and always very quick to respond. We would also like to thank Princess, the receptionist, as well as the Italian receptionist whose name we unfortunately don't remember, for always being kind and welcoming. We are extremely grateful to Dr Suraya, who performed many of our scans and was exceptional throughout the process, and to Dr Rao, who followed our journey step by step with great care, professionalism and attention. Finally, a big thank you to all the nurses, especially Hannah,Ella and Paige, for their support, kindness and professionalism. Overall, we felt very well cared for and supported, and we truly recommend this clinic to anyone considering IVF!’

Alicia Gioia

12 January 2026, LWC London Bridge

‘The reception staff are amazing nothing is to much trouble. Always answered any queries we had. The whole team were brilliant from our first initial appointment too our very last. They made us feel so comfortable.’

Rachel Powell

12 January 2026, LWC Bristol

‘We don't know where to begin, this place truly is wonderful. So so comforting and welcoming. Every single staff member went above and beyond and really felt like family. We couldn't be more appreciative of everyone who helped us on our way to creat our little one, who is cooking away nicely at 20 weeks. From choosing a sperm donor to my egg collection and then to getting my wife pregnant with the embryos a few months later, it was so stress free and we felt supported every single step of the way. We can't thank all the lovely wonderful ladies at the Brentwood clinic enough for what they have helped us achieve- and of course the amazing people at the Harley street clinic for doing the procedures who were just as welcoming! Thank you all so so much, we can't wait to bring our little man to meet you all when we are ready to try for baby number 2 xxxxx’

molly bannister

9 January 2026, LWC Brentwood

‘Following a seminar I attended at LWC, I arranged a consultation with Dr. Naware who specialises in fertility for women over 40. It was a refreshing experience. Dr. Naware is empathetic, kind and thorough. The follow up from the clinic was excellent, with Safak, Patient Coordinator, providing regular updates.’

A Patel

9 January 2026, LWC London Bridge

‘We are incredibly grateful to London Women's Clinic - Canterbury for their outstanding care and support throughout our IVF journey. Both the Canterbury and Bromley teams surrounded us with genuine kindness, understanding, and constant attention. We always felt listened to and truly cared for, and the level of professionalism was exceptional at every stage. Thanks to their dedication and hard work, we had the chance to welcome our beautiful little daughter into the world. We cannot recommend this clinic highly enough.’

Natalia Twardochleb

8 January 2026, LWC Canterbury

‘We can't recommend the London Women's Clinic enough. My partner and I are a same-sex female couple and are currently pregnant with our baby due in July -- after only two attempts. From the moment we chose the London Women's Clinic, the experience was incredible. The Harrow branch in particular felt so welcoming and supportive. Carla Lang, Ana-Maria, Laura Adagbon, and Dr Gill were absolutely amazing -- accommodating, kind, friendly, and genuinely caring. They went above and beyond throughout our entire journey, even responding to emails outside of working hours, which meant so much to us. We had previously completed blood tests and scans at another clinic but didn't feel it was the right fit. The London Women's Clinic didn't push us to repeat everything unnecessarily -- they accepted our previous tests, which really showed that they are not money-driven. On that note, their pricing is also very affordable compared to other clinics. Dr Gill is incredibly thorough and precise, taking so many factors into account when planning treatment, which gave us complete confidence. Our insemination was carried out at the Harley Street London Women's Clinic by Dr Yogita Date, who was equally wonderful. She made us feel comfortable, supported, and genuinely wished us luck during the procedure. Overall, this clinic felt more like family than a medical service. Even now, they continue to check in on us and our pregnancy, which says everything about the level of care they provide. We are beyond grateful and wouldn't hesitate to recommend the London Women's Clinic to anyone starting their fertility journey.’

Maisie Thomas

8 January 2026, LWC Harrow

‘The team at LWC Harley Street have been outstanding. They have supported my wife and I through our IVF journey at every step, keeping us informed and making the entire journey feel seamless. A special thanks to Dr Serra, Nurse Mimi, Vita and the rest of the LWC team that have helped us along the way. We are now 20 weeks into our pregnancy and LWC have continued to follow up to ensure all is well. A big thank you once again and we highly recommend LWC Harley Street to anyone considering IVF.’

Keyur Nakum

29 December 2025, LWC Harley Street

‘Cannot fault the ladies here at all. I felt so so welcome and looked after during the visit and consultation. The nurses were so compassionate and lovely, and I really felt like I was being listened to and understood. Would recommend to anyone looking to start a fertility journey/make some enquiries into their fertility healthxx’

Ellie Brown

19 December 2025, LWC Canterbury

‘Myself and my partners experience with LWC in Canterbury has been AMAZING! They have been so supportive and friendly throughout our whole IVF journey and gave us no stress throughout any part of it. Would very highly recommend as our first round of ISCI IVF worked ’

Mia Summers

19 December 2025, LWC Canterbury