In a natural (unstimulated cycle) or clomiphene citrate cycle, mature follicle size is between 18 - 30 mm. If triggered, these cycles are typically triggered when follicle size is between 17-26mm (dependent of the practice and ivf lab). In a gonadotropin cycle, mature follicle size is between 16 - 20 mm. Typically, we can talk about 3-11 follicles, but their number is reduced with age. At the beginning of the menstrual cycle the largest follicles (5-10 mm) continue to develop, and the others regress. At 5-7 day one of the follicles 10 mm in size becomes dominant. Objectiveto identify follicle sizes on the day of trigger most likely to yield a mature oocyte following hcg, gnrh agonist (gnrha), or kisspeptin during ivf treatment. Designretrospective analysis to determine the size of follicles on day of trigger contributing most to the number of mature oocytes retrieved using generalized linear regression and random forest models applied to data from ivf. What is the right follicle size for conceiving? For ivf, how big should a follicle be for trigger? How many follicles should you have? How long does it take for follicles to mature? Get this free book on treating hormonal imbalance & irregular periods. What are follicles? Ovarian follicles are small sacks where eggs mature. Honore on mature egg follicle size it would be very very rare. Unless, of course, you mistook another type of cyst for follicle. Usually, your doctor will want to schedule your trigger shotor hcglh injectionwhen your follicles are just about to reach full mature size. A mature follicle that is about to ovulate will measure anywhere between 18 and 25 mm. Yes 9 follicles are a lot but they are all small - biggest being 15mm- when everyone else seem to have almost double my size folicles, my doctor did a double check when she realized i had 9 follies on 50mg clomid(she actually asked me if i did a overdose up to 100mg which i didnt). I have adhesions in my left tube and most likely if i get fertilized on my left it. A normal, mature follicle that is ready to ovulate and conceive is 18 to 30 millimeters in diameter. During a regular menstrual cycle, several different follicles begin to enlarge and mature, but only one follicle can complete the maturation process each month. Mature follicles during the course of ovarian stimulation, youll visit the clinic so that the specialists can keep an eye on the number and size of the follicles developing. A mature and viable follicle which is ready to release an egg should ideally be close to 20mm long. As in a semen sample not all spermatozoa have enough quality to fertilize an egg and not all follicles contain mature eggs, or not all eggs have the same quality.