UNITTAS – meaning "United" in Spanish. Our hospital is conceived by the united efforts and collective participation of senior, well experienced medical professionals and professionals from other service sectors.
UNITTAS – meaning "United" in Spanish. Our hospital is conceived by the united efforts and collective participation of senior, well experienced medical professionals and professionals from other service sectors.
Follicular study, also known as follicle monitoring or serial follicular scanning, is a series of transvaginal ultrasounds performed during a menstrual cycle to track the growth and development of ovarian follicles. This simple, painless test helps doctors determine the exact time of ovulation, assess egg quality, and plan the best moment for natural conception, timed intercourse, IUI, or IVF trigger injection.
At Unittas Hospital, our dedicated fertility unit performs over 3,000 follicular scans every year with high-precision ultrasound machines.
Book Follicular StudyA follicular study scan is recommended in the following situations:
The test provides critical information about follicle size, number, growth rate, endometrial thickness, and ovulation timing - all essential for successful conception.
The procedure involves a series of short transvaginal ultrasound scans:
| Cycle Day | Purpose of Scan | Typical Findings Expected |
|---|---|---|
| Day 2-3 | Baseline scan | Small antral follicles <8 mm, thin endometrium |
| Day 7-8 | Early response check | Growing follicles 8-12 mm |
| Day 10-14 | Daily or alternate-day monitoring (most important) | Dominant follicle reaches 18-24 mm |
| Day of hCG trigger | Final pre-ovulation scan | Follicle ≥18 mm + endometrial thickness ≥8 mm |
| 24-36 hrs after trigger | Confirmation of ovulation | Collapsed follicle, free fluid in POD |
Each scan takes only 5-10 minutes. No anaesthesia or hospital admission is required.
| Parameter | Ideal Range for Conception |
|---|---|
| Dominant follicle size | 18-24 mm at the time of rupture |
| Daily growth rate | 1.5-2 mm per day |
| Number of mature follicles | 1-3 (more than 3 increases multiple pregnancy risk) |
| Endometrial thickness | Triple-line pattern, 8-14 mm |
| Endometrial pattern | Trilaminar (triple-line) appearance |
When the leading follicle reaches ≥18 mm and the endometrium is receptive, your doctor will advise timed intercourse, IUI, or administer the hCG trigger shot.
Typically 3-5 scans per cycle are needed: a baseline scan on day 2-3, followed by 2-4 monitoring scans between day 8-14, depending on how quickly your follicles grow. More scans may be needed for IVF cycles.
If follicle growth is slow or absent, your doctor may adjust medication dosages, switch to different fertility drugs, or investigate underlying causes like PCOS or diminished ovarian reserve. This is why monitoring is so valuable.
No, follicular study is painless. It's done via transvaginal ultrasound which causes only mild pressure. Each scan takes just 5-10 minutes and you can resume normal activities immediately.
Visit any of our diagnostic centers for your ultrasound scan
Track your ovulation with expert care at Unittas Hospital.
Call 044-4012-4012 Book Online
