B-ultrasound examination of follicles

In daily life, many couples who have children late in life suffer from many physical obstacles due to not having their birthdays on time. Many friends who are preparing to get pregnant will go for B-ultrasound to check the follicles. This examination is to determine whether the body has healthy eggs and follicles.

Infertile patients often need to know whether ovulation is normal. If ovulation is impaired, it is necessary to monitor follicle development during drug treatment to guide clinical medication, sexual life, artificial insemination and follicle puncture.

1. Ultrasound manifestations of follicular development during normal menstrual cycle

(1) Time of follicle appearance: At the beginning of each menstrual cycle, multiple follicles develop simultaneously, but generally only one or two follicles develop to maturity, called the primary follicles (dominant follicles), and the remaining follicles close one after another. Some authors have reported that in more than 90% of the cycles, only one follicle grows rapidly to maturity, and 5%-11% have two main follicles develop. The earliest time for ultrasound imaging of follicles can be 5-7 days in the menstrual cycle, and the minimum diameter displayed is 4-5mm.

(2) Follicle growth rate: Ultrasound can reveal small follicles in the ovaries on the 3rd to 5th day of the menstrual cycle. These follicles gradually grow larger, reaching their largest size on the 14th day on average, and ovulation can occur. From the 5th day of menstruation to before ovulation, the primary follicle grows an average of 1.5mm per day; before the 10th day, it grows an average of 1.2mm per day; 4 days before ovulation, it grows an average of 1.9mm until the follicle matures.

Mature follicles may show the following characteristics: ① The follicles are round or oval, with a diameter of 15-30mm (21.2+-0.53mm), and the follicles are echo-free, clear and pure, with clear boundaries and thin walls. ② One day before ovulation, 20% of mature follicles can be seen in the cumulus image, which appears as a short and strong echo near the wall of the follicle. The ultrasonic measurement values ​​of the growth and development of primary follicles in 54 normal natural cycles by the Department of Obstetrics and Gynecology of Shanghai Medical University Hospital are shown in the table below.

In daily life, friends who are preparing to become pregnant should pay attention to themselves and check various physical indicators in daily life, especially sperm and eggs, in order to prevent the occurrence of fetal malformations. The above is an introduction to B-ultrasound examination of follicles.