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Related Concept Videos

Fertilization01:38

Fertilization

During fertilization, an egg and sperm cell fuse to create a new diploid structure. In humans, the process occurs once the egg has been released from the ovary, and travels into the fallopian tubes. The process requires several key steps: 1) sperm present in the genital tract must locate the egg; 2) once there, sperm need to release enzymes to help them burrow through the protective zona pellucida of the egg; and 3) the membranes of a single sperm cell and egg must fuse, with the sperm...
Birth Control Methods01:22

Birth Control Methods

Vasectomy is a surgical form of male sterilization that involves severing and sealing the vasa deferentia, preventing sperm from mixing with semen during ejaculation. Because a vasectomy does not impact the testes' ability to produce testosterone, hormone levels, libido, and sexual function generally remain unchanged. While vasectomy is highly effective in preventing pregnancy, with a success rate near 99.85%, rare cases of recanalization (spontaneous reconnection) can occur. Although vasectomy...
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...
Infertility in Males01:23

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
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...
Cloning of Dolly the Sheep01:08

Cloning of Dolly the Sheep

The first successfully cloned mammal was Dolly, a sheep, born on 5th July 1996 at Roslin Institute, Scotland. The cloned sheep was named after the American singer Dolly Parton. Dolly lived for seven years and died of respiratory complications, which is speculated to be due to the actual age of her DNA. Because the DNA in cloned cells belongs to an older individual,  the cloned individual’s life expectancy may be affected. Indeed, analysis of Dolly’s DNA revealed shorter telomeres than other...

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Related Experiment Video

Updated: Jun 4, 2026

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization
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Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Published on: October 24, 2025

Fertility planning status: united states, 1965.

N B Ryder1, C F Westoff

  • 1Center for Demography and Ecology, University of Wisconsin, 53706, Madison, Wisconsin.

Demography
|February 1, 2011
PubMed
Summary

Fertility planning failures, including unintended pregnancies, are common among married women. Factors like race, religion, and education influence the likelihood of these failures, suggesting potential areas for reproductive health interventions.

Area of Science:

  • Sociology
  • Demography
  • Public Health

Background:

  • Understanding fertility planning is crucial for reproductive health and family planning services.
  • Previous studies have highlighted the complexities of pregnancy intentions and outcomes.
  • Assessing the reliability of self-reported data on fertility planning is an ongoing challenge.

Purpose of the Study:

  • To classify fertility planning status using a national sample of married women.
  • To analyze the incidence of "number failure" and "timing failure" in pregnancies.
  • To examine demographic and socioeconomic correlates of fertility planning failures.

Main Methods:

  • Utilized data from a national sample of 4810 married women.
  • Categorized fertility planning status into five classes: never-pregnant, number failure, timing failure, timing success, and neither.

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Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

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Fertility Preservation in Patients with Severe Ovarian Dysfunction
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Fertility Preservation in Patients with Severe Ovarian Dysfunction

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Related Experiment Videos

Last Updated: Jun 4, 2026

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization
06:40

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Published on: October 24, 2025

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

Fertility Preservation in Patients with Severe Ovarian Dysfunction
12:03

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

  • Analyzed failure rates based on pregnancy intentions (wanting more children vs. no more children).
  • Main Results:

    • Among women intending no more children, 32% experienced "number failure" and 62% experienced "timing failure".
    • Among women intending more children, 67% experienced "timing failure".
    • Failure probabilities varied significantly by race, religion, and education levels, with higher rates among Black women, Catholics, and lower education levels.

    Conclusions:

    • Fertility planning failures are prevalent and influenced by socioeconomic and demographic factors.
    • The reliability of self-reported data on pregnancy timing desires may be questionable for certain groups.
    • Findings suggest underestimation of true failure rates in completed families due to reporting issues and ongoing exposure to risk.