Patient: Dr. Malpani, I’ve been reading about ovarian stimulation during IVF, and I assumed that all my follicles should grow at the same rate since they’re exposed to the same medication. But my doctor mentioned that some follicles are growing faster than others. Is this normal?
Dr. Malpani: That’s a great question! Ideally, yes, we’d love for all the follicles to grow at the same pace. That would make it much easier to decide when to trigger ovulation and collect the eggs. After all, we’re giving them all the same dose of Gonal-F (FSH) every day, so logically, they should respond uniformly. But the human body rarely follows a textbook!
Patient: So, if follicles don’t grow evenly, what happens?
Dr. Malpani: This is called asynchronous follicular growth, and it’s very common. Some follicles grow faster, while others lag behind. This poses a tricky dilemma when deciding when to administer the HCG trigger shot. Do we trigger based on the size of the largest follicle, even if some smaller ones aren’t mature yet? Or do we wait for the smaller ones to catch up, knowing that the biggest follicle might become overripe?
Patient: That sounds complicated! What do doctors usually do in this situation?
Dr. Malpani: It’s a balancing act. Our goal is to maximize the number of mature eggs while avoiding the risk of post-mature follicles that may not fertilize well. To make the best decision, we consider multiple factors:
✅ The total number of days of stimulation – A longer stimulation could allow smaller follicles to catch up.
✅ The total dose of FSH used – This affects how aggressively the ovaries are being stimulated.
✅ Estradiol levels – This gives us an idea of the maturity of the follicles.
✅ Follicle size distribution – We closely monitor this through ultrasound scans.
Despite our best efforts, we only truly know if we made the right decision on the day of the egg collection!
Patient: That sounds frustrating. Isn’t there a way to control follicular growth better?
Dr. Malpani: We’ve tried! Doctors have experimented with several approaches to make follicular growth more uniform:
1️⃣ Pre-treatment with oral contraceptives – This helps synchronize follicle growth before starting stimulation.
2️⃣ Using a long GnRH agonist protocol – This can suppress natural hormonal fluctuations and create a more controlled response.
3️⃣ Adjusting FSH doses dynamically – Increasing or decreasing medication based on follicle response.
But despite all these strategies, results are mixed, especially in women with poor ovarian reserve. The reality is that every woman’s ovaries respond differently, and there’s still no guaranteed way to make follicles grow in perfect sync.
Patient: So, if I have follicles growing at different rates, what should I do?
Dr. Malpani: First, don’t panic—this happens to many women. Second, have an open discussion with your doctor about their strategy for timing the trigger shot. Here’s what you should ask:
🔹 Are we prioritizing egg quantity or quality? – Some doctors prefer triggering earlier to ensure higher quality, while others wait to get more eggs.
🔹 What does my estradiol level suggest? – This hormone can help predict egg maturity.
🔹 What’s the plan if we retrieve some immature eggs? – Sometimes, labs can mature them in vitro (IVM).
If your doctor seems unsure or is pushing for a decision without explaining why, that’s a red flag. Always insist on transparency.
Patient: That makes sense. But if doctors can’t always predict the best time, how do I know if my cycle was managed well?
Dr. Malpani: Great question! After egg retrieval, ask your doctor for a detailed breakdown of your results:
🔸 How many eggs were retrieved? – Compare this to the number of mature follicles seen on ultrasound.
🔸 How many were mature? – Ideally, most retrieved eggs should be mature.
🔸 How many fertilized? – A low fertilization rate could suggest that some eggs were over- or under-matured.
If you feel your cycle could have been managed better, consider getting a second opinion before your next attempt.
Patient: I’m glad I asked you about this! I would have just assumed all follicles should grow at the same rate.
Dr. Malpani: That’s why I always say—informed patients get better IVF outcomes! The more you understand your cycle, the better you can advocate for yourself. For direct advice, you can get information to any query related to your IVF treatment from my Twin instantly at https://www.drmalpani.com/chat-w-chatbot/index.html