How big can the follicles be before the eggs can be retrieved?

There is a certain normal range for follicles. Follicles are very important to the human body. When we perform IVF, we need to take out the fertilized eggs, but the size of the fertilized eggs should be limited. However, many people do not know its specific size, or have never understood its specific size. So how big can the follicles be before the eggs can be taken out?

The doctor looks at the entire follicle group. Generally speaking, the diameter of the follicles with fertilization function is generally between 15 and 22 mm. The doctor will perform B-ultrasound monitoring according to the situation. If 70% to 80% of the follicles are between 14 and 22 mm, it is considered appropriate and eggs can be retrieved. On the contrary, if there is only one 18 mm follicle and the others are all 10 mm, they will not be retrieved. Therefore, the decision on oocyte retrieval should be based on the average proximal line of the majority of follicle groups.

Under the condition of ovulation induction, the developed follicles are generally larger, larger than the follicles in our normal natural cycle, so the time of egg retrieval is generally determined when the average follicle is 18-20mm, combined with the estrogen level. The size of the follicle is not absolute. We also need to consider her ovulation induction time, her response to medication, and her final estrogen level to determine her egg retrieval time. In addition, we will also observe the follicles through B-ultrasound, the tension of its capsule, the thickness of the membrane, and the size relationship between follicles to make a comprehensive judgment.