Folliculometry is a procedure that involves performing a series of ultrasound examinations in order to monitor the growth of follicles in the ovary. It is done from the 9th to the 20th day of the menstrual cycle (if the cycle lasts 28 days). Based on the findings of these ultrasound examinations, the exact time of ovulation can be estimated. Each ultrasound examination takes about 20 minutes. On average, there are 4 to 6 such reviews within the menstrual cycle.

What is follicle?

During the normal menstrual cycle inside the follicles located in the ovary, the eggs develop. Follicle is a structure with a thin wall containing the egg cell and liquid. The follicle can be seen on the screen of the ultrasonic device when it is 7-8 mm in size and is seen as a circular bubble filled with liquid. The follicle grows 1-2 mm per day, and the ovulation is ready when it is in the diameter of 17-25 mm. During folliculometry, the number of follicles in development are monitored and recorded, their size and the time of ovulation.


• In order to determine the existence of ovulation and the exact time of ovulation.

• For the purpose of further examination (if you previously had one or more spontaneous abortions).

• If you are taking medication that stimulates the formation of ovulation.


• Ultrasound examination is performed by the patient lying on the back in the same position as during the standard gynecological examination. An ultrasound examination uses a probe placed in the vagina (the so-called vaginal probe), and the review is called a transvaginal ultrasound examination. The process is relatively painless. A condom is placed over the probe and a small amount of gel.

• During folliculometry, the doctor monitors and records the number of follicles in development, their size and the time of ovulation (if it occurs). This examination can also determine the thickness of the mucous membrane of the uterus, which is very important in the process of starting a pregnancy (the matured mucus creates a large amount of hormones that can thicken the mucous membrane). Based on the thickness and appearance of the uterus of the uterus on ultrasound, it can be indirectly concluded how much of a hormone is produced.


There is no risk in performing these ultrasound examinations.


Most often, no special preparation for this test is required. Before screening, it is necessary to wet and completely empty the bladder