Follicular Study or Monitoring is a process of assessing the ovarian follicles at regular intervals to document the path to ovulation. It is a vital component in assessing and timing the in-vitro fertilization (IVF).
- Dominant follicles from the prior menstrual cycle are selected for the next cycle. There may be about 3-11 follicles of about 2-5mm in size. This process is called “recruitment”.
- Of the recruited follicles, certain follicles are selected (size about 5-10 mm) during day 1-5 of the menstrual cycle. This is called “follicular selection”.
- Of the selected follicles one of them dominates the others during day 5-7 of the menstrual cycle. This process is called “dominance”. It reaches a size of 17-27mm.
- Rapid follicle growth takes place on nearing ovulation . The follicle starts protruding from the ovarian cortex and explodes to release the ovum along with some antral fluid.
Transvaginal ultrasound beginning from Day 3 of the cycle helps monitor the follicles