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Related Concept Videos

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...
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...
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...
In Vitro Fertilization01:24

In Vitro Fertilization

In vitro fertilization (IVF) is a form of assisted reproductive technology where an egg is fertilized with sperm in a controlled laboratory environment before transferring the resulting embryo into the uterus. This process is designed to help individuals and couples experiencing difficulties conceiving.
The IVF process begins with ovarian stimulation, during which reproductive endocrinologists prescribe hormonal medications to stimulate the ovaries to produce multiple eggs instead of the single...

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Related Experiment Video

Updated: Jun 11, 2026

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives
08:46

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

Letrozole for ovulation induction and controlled ovarian hyperstimulation.

Elizabeth A Pritts1

  • 1Wisconsin Fertility Institute, Middleton, Wisconsin 53562, USA. lapskyboy@aol.com

Current Opinion in Obstetrics & Gynecology
|July 2, 2010
PubMed
Summary

Letrozole, an aromatase inhibitor, offers a safer and potentially more effective alternative to clomiphene citrate for infertility treatment. Studies show comparable or superior pregnancy rates with fewer side effects.

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Area of Science:

  • Reproductive Endocrinology
  • Pharmacology

Background:

  • Letrozole is an aromatase inhibitor used for infertility treatment.
  • It functions similarly to clomiphene citrate but offers additional benefits.

Purpose of the Study:

  • To review the latest studies on letrozole for infertility.
  • Emphasis on dose, duration, safety, follicle development, and pregnancy outcomes.

Main Methods:

  • Review of recent scientific literature on letrozole in infertility treatment.

Main Results:

  • Letrozole demonstrates fewer side effects and a shorter half-life than clomiphene citrate.
  • It is effective for chronic anovulation, unexplained infertility, and diminished ovarian reserve.
  • Pregnancy rates with letrozole are equal or superior to clomiphene citrate and potentially better than gonadotropins in some cases.

Conclusions:

  • Letrozole may replace clomiphene citrate as a first-line treatment for anovulatory infertility.
  • It can be used alongside or instead of gonadotropins.
  • Further research is needed to optimize dosing and confirm long-term safety.