What is the normal size of ovarian follicles?

A healthy follicle can help with pregnancy. If people's follicles are unhealthy, it will lead to poor pregnancy results and even infertility problems. Therefore, when most couples go to the hospital for a check-up, the doctor will check the female follicles and the male sperm to see if they meet the pregnancy criteria, because unhealthy follicles may also cause problems in the development of the embryo during pregnancy.

What is the normal size of follicles?

Normally, we cannot see the egg before ovulation because it is very small. Only when it develops into a follicle can we see it under a microscope. At that time, it is already very large. The 10th to 14th day before menstruation is called the ovulation period.

A mature egg is generally larger than 20mm, and the smallest one is normal at more than 18mm. The growth from primary follicle to mature follicle can be divided into 8 levels. The first five levels are too small and take too long to grow, so they do not have much practical significance. The focus should be on the 6th level onwards. The diameter of the level 6 follicle is 5mm; after 5 days, it grows to 10mm and becomes the level 7 follicle; after another 5 days of development, it reaches the level 8 follicle with a diameter of 16mm. The 8th level follicles are mature follicles.

Therefore, it takes a total of 10 days for the 6th level follicle to grow to the 8th level follicle, which is exactly the follicular phase in a menstrual cycle. Starting from 16mm, after another 2-3 days, it will develop into a 20mm follicle and the egg will be released.

The size of the follicles has a great impact on whether the follicle development is normal. If the follicle size is not standard and does not reach the normal value, it will affect normal ovulation or the quality of the discharged eggs will be poor, affecting normal conception. So what is the normal size of follicles?

The normal standard for follicle size is that the follicle is round or oval, with a diameter of 18-25mm. If it is lower or larger than the normal size, it will affect normal ovulation. Ultrasound monitoring shows that the largest follicle appears on the 10th to 16th day of menstruation. The follicle is 20mm in diameter, round in shape, with thin walls, protruding to one side of the ovary, and has good internal sound transmission. Ovulation usually occurs within 10 hours, and ovulation is more common on the 12th to 18th day of menstruation, and a few occur on the 20th to 30th day.