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Related Concept Videos

Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...
Oogenesis01:22

Oogenesis

Oogenesis,  the process of developing egg cells (female gametes), occurs within the ovaries and is fundamental to female fertility. This sequence begins during fetal development when diploid oogonia in the developing ovaries undergo mitotic divisions to produce primary oocytes. By birth, these primary oocytes enter prophase I of meiosis but become arrested in this stage, remaining suspended until puberty.
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...
Ovaries01:26

Ovaries

The ovaries are roughly the size of almonds and measure approximately 2 to 3 centimeters in length. These paired structures are situated within the pelvic region and are anchored by the mesovarium—a peritoneal extension that also connects them to the wider structure of the broad ligament. The support system extends to the suspensory ligament, housing blood and lymphatic vessels. In addition, the ovarian ligament tethers the ovaries to the uterus.
On the ovarian surface, a layer of cuboidal...
Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
Ovarian Cycle01:27

Ovarian Cycle

The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...
Infertility in Females01:28

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of endometrial...

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Updated: Jul 5, 2026

Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation
05:42

Z-Scores for Assessing Ovarian Reserve in Young Patients Undergoing Fertility Preservation

Published on: October 25, 2024

Ovarian reserve.

Maria Elisabetta Coccia1, Francesca Rizzello

  • 1Department of Gynaecology, Perinatology and Human Reproduction, University of Florence, 50100 Florence, Italy. cocciame@tin.it

Annals of the New York Academy of Sciences
|April 30, 2008
PubMed
Summary
This summary is machine-generated.

Women delaying pregnancy face infertility due to decreased ovarian reserve. Combining multiple tests, not just one, can accurately predict fertility and guide ovarian stimulation for better in vitro fertilization outcomes.

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Area of Science:

  • Reproductive Endocrinology
  • Infertility Research
  • Assisted Reproductive Technologies

Background:

  • Social trends lead women to postpone childbirth, increasing infertility risks.
  • Aging oocytes and diminished ovarian reserve are primary causes of age-related infertility.
  • Accurate ovarian reserve screening is crucial for predicting pregnancy chances and optimizing fertility treatments.

Purpose of the Study:

  • To evaluate the effectiveness of various tests in assessing ovarian reserve.
  • To identify reliable predictors of pregnancy success and response to ovarian stimulation.
  • To determine if a combination of tests offers superior accuracy over single markers.

Main Methods:

  • Review of hormonal markers: follicle-stimulating hormone (FSH), luteinizing hormone (LH), estradiol, inhibin, anti-Müllerian hormone.
  • Assessment of ultrasound parameters: ovarian volume, antral follicle count.
  • Inclusion of dynamic tests (GnRH agonist, FSH, clomiphene citrate) and ovarian biopsy.

Main Results:

  • No single test accurately predicts ovarian reserve or treatment success.
  • Simultaneous evaluation of multiple tests shows promise.
  • Combined testing serves as a sensitive predictor of diminished ovarian reserve and stimulation response.

Conclusions:

  • A comprehensive approach combining various hormonal and ultrasound markers is necessary for accurate ovarian reserve assessment.
  • This multi-test strategy can guide personalized in vitro fertilization (IVF) treatment protocols.
  • Improved prediction of ovarian response can enhance IVF success rates for women with delayed childbearing.