What is the ideal follicle size for an IVF trigger?

For a successful IVF trigger, we look for at least 2 or more follicles reaching a size of 18 mm or greater, or when 40% of recruited follicles reach 19-20 mm.

When does oocyte retrieval happen in IVF?

Oocyte retrieval is carefully timed after the HCG or GnRH agonist trigger. Precision is vital; retrieving too early results in immature eggs, while waiting too late leads to spontaneous ovulation and loss of oocytes.

When is ultrasound done during an IUI cycle?

Ultrasound is typically done on Day 2 of menses to check the baseline status, and then again starting from Day 9 to monitor follicular growth until the dominant follicle reaches 20-22 mm.

How many hours after the HCG trigger is IUI performed?

IUI is usually performed approximately 36 hours after the HCG trigger injection to coincide with the rupture of the follicle (ovulation).

Planned IVF Treatment: Navigating the Stimulation Phase

Name: The IVF Process: Stimulation to Retrieval | Dr. Pankaj Talwar
Creator: Dr. Prof (Col) Pankaj Talwar, VSM

Dr. Prof (Col) Pankaj Talwar, VSM, MD, PhD

Delhi NCR & Gurugram’s Leading IVF Specialist | Reg: HMC-HN 16822

Embarking on a journey with one of the best IVF treatment centres in Delhi, NCR, and Gurugram requires a clear understanding of the clinical steps involved. Successful IVF is a result of meticulous planning, starting from the very first days of your menstrual cycle.

1. The Foundation: Ovarian Stimulation

Ovarian stimulation is initiated on the 2nd or 3rd day of the menstrual cycle. Before starting, we perform baseline ultrasonography and biochemical tests to ensure the body is in the optimal state for down-regulation. The ideal baseline includes:

Thin Endometrium: Measuring between 2–4 mm.
Follicle Size: No follicles should be larger than 9 mm (ideal range is 2–9 mm).
Hormone Levels: Serum E2 should be <25 pg/ml and LH should be <4–5 IU/L.

2. Stimulating Multiple Follicles

Unlike a natural cycle where only one dominant follicle is produced, IVF requires multiple enlarging follicles. To achieve this, Gonadotrophins (225 IU to 300 IU) are administered intramuscularly for 6–7 days. Follicular growth is then monitored every alternate day starting from Day 7.

3. The Trigger: Predicting Ovulation

By combining sonographic observation (Days 7–10) with serum estradiol hormone levels, we can accurately predict the time of ovulation. The “Trigger” injection (HCG, recombinant HCG, or GnRH agonists) is given when:

Trigger Criteria:

At least 2 follicles reach 18 mm or more.
Or, when 40% of recruited follicles (which can reach up to 20 in number) are 19–20 mm or greater.

4. The Critical Window: Oocyte Retrieval

Timing oocyte retrieval is the most critical stage of the IVF cycle. Careful planning permits the optimal retrieval of mature eggs. If aspiration is done too early, the oocytes will be immature and fail to fertilize. If done too late, the eggs may be spontaneously released and lost in the peritoneal cavity.

Why Choose Talwar Fertility?

At Talwar Fertility & Child Health Centre, we specialize in personalized stimulation protocols. By closely monitoring hormone levels and follicular diameter, we ensure that every patient receives the precise timing required for a successful pregnancy outcome.

Start Your IVF Journey with Confidence

Consult Dr. Pankaj Talwar for world-class IVF treatment and precision-timed oocyte retrieval.

📞 +91 9810790063

📍 3118, 3rd Floor, Sector 46, Near Ambedkar Chowk, Gurugram, Haryana

Visit: www.drpankajtalwar.com

Are You Planned for IUI? Your Step-by-Step Roadmap

Dr. Prof (Col) Pankaj Talwar, VSM, MD, PhD

Medical Council Registration Number: HMC-HN 16822

Intrauterine Insemination (IUI) is often the first step for many couples on their fertility journey. It is a less invasive and more affordable procedure than IVF, but its success depends heavily on precise timing and ultrasound monitoring. At Talwar Fertility & Child Health Centre, we follow a meticulous protocol to ensure the best possible outcome.

Phase 1: The Baseline Scan (Day 2)

The journey begins on the 2nd day of your menses (D2). This initial ultrasound is critical to:

Assess the Antral Follicular Count (AFC).
Rule out any pre-existing ovarian cysts, such as follicular or corpus luteal cysts, that might interfere with the current cycle.

Phase 2: Ovulation Induction

If the baseline scan shows an endometrial thickness of less than 4 mm and no follicles larger than 6 mm, we proceed with Ovulation Induction. Medication (Clomiphene Citrate or Letrozole) is started on Day 2 or Day 3 for five days. Depending on the patient’s profile, Gonadotrophins may also be added.

Phase 3: Follicular Monitoring

Transvaginal Sonography (TVS) begins on the 9th day of menses (D9). We track the growth of the follicles every alternate day. The goal is to identify a “Dominant Follicle.”

Phase 4: The Trigger and Insemination

Once the dominant follicle reaches a mature size of 20-22 mm, we administer a “Trigger” injection of Human Chorionic Gonadotrophin (HCG) (5000/10000 IU). This mimics the body’s natural surge that causes the egg to be released.

The 36-Hour Window:

IUI is performed 36 hours after the HCG Trigger. Just before the procedure, a final ultrasound is done to confirm that the follicle has ruptured, ensuring the egg is ready for the processed sperm.

Why Timing is Everything

At our Gurugram clinic, we emphasize that IUI success is a science of timing. By aligning the insemination exactly with the rupture of the follicle, we maximize the chances of fertilization. If you are planned for an IUI, following this schedule precisely is the most important thing you can do.

Start Your IUI Journey in Gurugram

Expert monitoring and personalized protocols can make the difference in your success. Schedule your Day 2 scan today.

📞 +91 9810790063

📍 3118, 3rd Floor, Sector 46, Near Ambedkar Chowk, Gurugram, Haryana

Visit: www.drpankajtalwar.com