What is Folliculometry?
Ovulation is a key part of a woman’s menstrual cycle, where an egg is released from the ovary. Problems with ovulation are a common cause of infertility in women. In 1978, Dr. Joachim Hackelöer introduced the use of ultrasound to observe the growth of follicles—small sacs in the ovaries that contain eggs—during the menstrual cycle. Later, a technique called transvaginal sonography (TVS) was developed. In this method, a small ultrasound probe is inserted into the vagina, bringing it closer to the ovaries and uterus. The benefits of transvaginal ultrasound include: Folliculometry, also known as follicular monitoring, is a series of ultrasound scans used to track the development of ovarian follicles—small sacs in the ovaries that contain eggs—throughout a woman’s menstrual cycle. This process helps identify the best time for conception and is commonly used in natural cycles, as well as during fertility treatments like Intrauterine Insemination (IUI) and In Vitro Fertilisation (IVF). Typically performed via transvaginal ultrasound, folliculometry usually begins on day 2 or 3 of the menstrual cycle and continues until ovulation is confirmed. The monitoring process is divided into three main phases: Follicular phase assessment via ultrasound scan Baseline Scan: A baseline ultrasound scan is an important procedure performed at the start of a woman’s menstrual cycle, typically on day 2 or 3. This transvaginal ultrasound provides valuable insights into reproductive health and is especially useful for those considering fertility treatments like Intrauterine Insemination (IUI) or In Vitro Fertilization (IVF). Purpose of the Baseline Scan: What is Ovarian Reserve: This refers to the number of eggs a woman has available. By counting the small antral follicles (each measuring between 2–10 mm) in the ovaries, doctors can estimate ovarian reserve. A higher count suggests a better response to fertility treatments. What is Ovarian Response: This indicates how the ovaries might react to fertility medications. Understanding this helps in tailoring the appropriate drug dosage for treatments like IUI or IVF. Key Assessments During the Baseline Scan: Advantages of AFC (Antral Follicle Count): Clinical Application: In stimulated fertility cycles, such as those involving Assisted Reproductive Technology (ART), combining AFC with factors like age, ovarian volume, and other ultrasound parameters helps in customizing the dosage of gonadotropins. This tailored approach aims to optimize ovarian response and improve the chances of successful treatment outcomes. Pre-Ovulatory Scan: A pre-ovulatory scan involves a series of ultrasound examinations during the follicular phase of the menstrual cycle to monitor the growth of ovarian follicles and predict ovulation timing. The schedule for these scans varies depending on the type of cycle: Purposes of Serial Scans: Luteal Phase Assessment: After ovulation, the ruptured follicle transforms into the corpus luteum, which produces progesterone to prepare the endometrium for potential implantation. Ultrasound scans during this phase confirm: Clinical Significance: Folliculometry offers a comprehensive evaluation of the menstrual cycle, aiding in: Transvaginal ultrasound (TVS) enhances the accuracy of follicular monitoring, providing detailed images of ovarian and endometrial structures. In summary, serial ultrasound scans are indispensable in reproductive medicine, offering critical information for optimizing fertility treatments and improving the likelihood of successful conception.