Размери на фоликулите по дни на цикъла: видове и ...

Nov 16, 2022

Welcome to Weissman Douglas M MD PA Facp's website, where we provide detailed information about follicle sizes during different days of the menstrual cycle. If you are interested in understanding the intricacies of reproductive health and the significance of follicle development, you've come to the right place.

Understanding Follicles and the Menstrual Cycle

In order to fully comprehend follicle sizes, it is important to have a solid understanding of the menstrual cycle and its different phases. The menstrual cycle typically lasts from 28 to 32 days and is broken down into four main phases: menstruation, the follicular phase, ovulation, and the luteal phase.

During the follicular phase, which usually lasts for about 10 to 14 days, follicles gradually grow and develop in the ovaries. These follicles contain eggs, and as they mature, one dominant follicle will emerge and eventually release an egg during ovulation.

The Significance of Follicle Sizes

Follicle sizes play a crucial role in determining reproductive health and fertility. Monitoring follicle growth is commonly done through ultrasound measurements, where the size is measured in millimeters (mm). The size of the dominant follicle indicates the stage of the menstrual cycle and helps to predict ovulation.

During the follicular phase, follicles start at a small size, typically around 2-4 mm. As the cycle progresses, the dominant follicle continues to grow, reaching between 18-25 mm just before ovulation. This increase in size is encouraged by the hormone follicle-stimulating hormone (FSH) released from the pituitary gland.

Types of Follicles

There are several types of follicles that are important to understand:

Primary Follicles

Primary follicles are the earliest stage of follicle development. At this stage, the follicle is encased in a single layer of cells and does not yet contain a mature egg. These follicles have a small size and are typically less than 10 mm in diameter.

Secondary Follicles

Secondary follicles are the next stage of development. At this point, the follicle undergoes a process called antral follicle growth, where a fluid-filled cavity forms within the follicle. The diameter of secondary follicles ranges from 10 to 12 mm.

Graafian Follicles

Graafian follicles are the final stage of follicle development and are considered mature follicles. They are characterized by a large size, typically ranging from 18 to 25 mm. The dominant Graafian follicle will eventually rupture during ovulation, releasing the mature egg.

Understanding Follicle Sizes by Day of the Menstrual Cycle

Let's dive deeper into the different sizes of follicles throughout the menstrual cycle:

Day 1:

On the first day of the menstrual cycle, follicles are still in their early stages of development. They are small in size, measuring around 2-4 mm.

Day 5-7:

As the follicular phase progresses, primary and secondary follicles continue to grow and develop. By day 5-7, their size typically ranges from 5-10 mm.

Day 10-12:

By this stage, a dominant follicle starts to emerge. The dominant follicle will continue to grow while others either regress or stop developing. The dominant follicle reaches a size of around 18-25 mm.

Day 13-14:

Just before ovulation, the dominant follicle reaches its peak size. This occurs around day 13-14, where the follicle measures around 18-25 mm.

Day 15 onwards:

After ovulation, the dominant follicle transforms into the corpus luteum, which plays a crucial role in producing progesterone. The ruptured follicle will gradually decrease in size over the next few days.


Understanding the sizes of follicles throughout the menstrual cycle is essential for monitoring reproductive health and fertility. Follicle development is a complex process, with different types and sizes indicating specific stages of the menstrual cycle.

At Weissman Douglas M MD PA Facp, we aim to empower individuals with detailed knowledge on reproductive health. By providing comprehensive information on follicle sizes and their significance, we hope to assist you in making informed decisions about your fertility and overall well-being.

Feel free to explore our website further to learn more about reproductive health, fertility treatments, and other related topics.

Julius Clark
Интересен и полезен материал! Много съм благодарен, че можем да разберем повече за размерите на фоликулите по време на различните дни от цикъла. Тази информация е много ценна за всички, които се интересуват от репродуктивното здраве. Благодаря на сайта на Weissman Douglas M MD PA Facp, че предоставя толкова подробни данни. Ще продължа да чета и да се информирам от тях.
Nov 12, 2023