Does having high-quality follicles guarantee ovulation?

The follicles play a relatively important role in the female reproductive system. If the follicles develop abnormally, it will be difficult for women to conceive. If the follicles develop well, that is, if there are dominant follicles, then the chance of conception will be greatly increased. Of course, this does not mean that having a dominant follicle will definitely lead to ovulation. Next, I will introduce you to some relevant knowledge about dominant follicles!

1. What is the dominant follicle

The so-called dominant follicle in medicine is a follicle that is larger than 10mm and smaller than 18mm on ultrasound. In the first half of the menstrual cycle - the follicular phase, under the action of estrogen. Usually several follicles develop successively and grow gradually. Through B-ultrasound monitoring, we find that near ovulation, there is always one follicle with the largest head, and after it ruptures and ovulates, the other follicles are absorbed and disappear one after another. We call this follicle with the largest head and the most mature development the dominant follicle. If the normal menstruation is 30 days, the follicle that grows to more than 1.0 on the tenth day of menstruation can be considered the dominant follicle.

Second, monitoring follicle examination method

Generally speaking, starting from the 8th day of the menstrual cycle, ultrasound monitoring should be done once every 2 days. When the diameter of the follicle is found to be 17 mm, monitoring should be changed to once a day. When the follicle matures and reaches a diameter of 20-23 mm, it should be measured twice a day if necessary until ovulation. The B-ultrasound probe frequency is 3.5MHz. Each monitoring is to observe the size and shape of both ovaries, record the number and size of follicles, the day of menstruation, etc.

When using B-ultrasound to monitor ovulation, infertile women with regular menstrual cycles and biphasic basal body temperature often assume that their follicular development is normal and neglect further examination. In fact, abnormal follicular development and ovulation are relatively common in such cases. It is very important to use B-ultrasound to monitor the detailed follicular development in women of childbearing age, especially infertile women, to confirm whether their follicles are mature, whether they ovulate and the time of ovulation, in order to provide a reliable basis for clinical symptomatic treatment.

3. Follicle maturation

There are ovarian and follicular manifestations of ovulatory cycle. Characteristics of mature follicles: The largest follicle monitored by B-ultrasound 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 permeability. Ovulation usually occurs within 10 hours, and the ovulation time is mostly between the 12th and 18th day of menstruation, and a few may occur between 20th and 30th days. Characteristics after ovulation: partial collapse of the follicle wall, wrinkled and jagged edges, with many faint light spots inside, and a 5-15mm liquid dark area visible in the uterine rectal crypts, which usually disappears one day after ovulation. The success rate of pregnancy during this period is as high as 90%.