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Follicular Monitoring
Follicular monitoring is a simple and effective technique used by gynaecologists to evaluate ovarian follicles at regular intervals. It helps track and document ovulation in women who are trying to conceive.
This process involves a series of ultrasound scans, usually performed through the transvaginal route, to closely observe follicle development.
Book an appointment: Dr Arockia Virgin Fernando, Fertility Specialist.
Understanding Follicles
Follicles are not the same as oocytes (eggs). A follicle is a functional structure within the ovary that contains the developing egg. Within the inner lining of the follicle, the egg matures during a natural or medically stimulated cycle. Follicles also contain supporting cells that produce oestrogen, which is essential for proper egg development.
Follicular Phase and Luteal Phase
The menstrual cycle consists of two key phases:
Monitoring the follicular phase is crucial for accurately predicting ovulation. Incorrect timing of the fertile window is a common cause of difficulty in conceiving. Follicular monitoring also helps identify conditions like anovulation (absence of ovulation).
How Is Follicular Monitoring Done?
Follicular monitoring usually starts on day 2 or 3 of the menstrual cycle and includes:
During monitoring, the size of the follicle is measured in two or three dimensions. Once a follicle reaches about 16 mm, it typically grows at a rate of 2 mm per day. When it reaches 19–20 mm, an HCG injection may be administered to trigger ovulation.
Ovulation (egg release) usually occurs within 36 hours after the trigger, though this can vary among individuals. This is why accurate monitoring and documentation of ovulation are essential for improving the chances of conception.
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