Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Limits to Natural Selection01:38

Limits to Natural Selection

30.0K
Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.
30.0K
Meiosis vs. Mitosis02:57

Meiosis vs. Mitosis

39.4K
Cell division is necessary for growth and reproduction in organisms. Mitosis aids cell growth and development by dividing somatic cells. In contrast, meiosis causes the division of germ cells and plays an essential role in sexual reproduction. Due to their unique functional requirements, mitosis and meiosis differ from each other in multiple aspects.
Before the start of mitosis and meiosis I, the cell synthesizes DNA, resulting in two homologous copies of each chromosome. DNA synthesis is...
39.4K
Teratogenicity01:07

Teratogenicity

4.2K
The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
4.2K
Development of Blood Vessels01:07

Development of Blood Vessels

2.0K
The development of the vascular system in a fetus is a complex and intricate process that begins as early as 15 to 16 days post-conception. This process starts outside the embryo, specifically in the mesoderm of the yolk sac, chorion, and connecting stalk. Approximately two days later, the formation of blood vessels occurs within the embryo itself.
The initial formation of this system is facilitated by the small amount of yolk present in the ovum and yolk sac. Blood vessels originate from...
2.0K
Types of Limits I01:23

Types of Limits I

297
Limits are a key mathematical concept for understanding how functions behave as their input approaches specific values, particularly when the function is undefined. They help reveal trends and discontinuities by examining the values a function approaches rather than its actual value.One-sided limits focus on the direction from which a value is approached. When a function behaves differently depending on whether the input approaches from the left or the right, the two one-sided limits may not...
297
Limits at Infinity01:24

Limits at Infinity

422
The function that decreases as the input becomes very large provides a clear example of how mathematical functions can behave at extreme values. When the input increases continuously, the output becomes smaller and smaller, getting closer to a particular fixed value. Although the output never actually reaches this value, it moves nearer to it without limit. This behavior is a fundamental concept in understanding how functions behave as the input grows indefinitely. The graphical representation...
422

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Current challenges in intrauterine management of obstructive fetal hydrocephalus and future directions.

Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology·2025
Same author

Prenatal diagnosis and characterization of extra-axial, supratentorial pial arteriovenous malformation using high-resolution transvaginal neurosonography.

Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology·2022
Same author

Elective delivery at 34 weeks vs routine obstetric care in fetal gastroschisis: randomized controlled trial.

Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology·2019
Same author

Preventing enthusiasm in response to clinical advances.

BJOG : an international journal of obstetrics and gynaecology·2019
Same author

The European Court of Human Rights on planned home birth: resolution of a paradoxical ruling.

BJOG : an international journal of obstetrics and gynaecology·2017
Same author

The unlimited-rights model of obstetric ethics threatens professionalism.

BJOG : an international journal of obstetrics and gynaecology·2017
Same journal

Readability of patient educational materials on ultrasound: a cross-sectional study.

Journal of perinatal medicine·2026
Same journal

Correlations between fetal left ventricular Tei index and different hemodynamic parameters during middle and late pregnancy at high altitudes.

Journal of perinatal medicine·2026
Same journal

The role of Coroners in perinatal death investigation in high-income countries: a scoping review.

Journal of perinatal medicine·2026
Same journal

The cytokine Prokineticin-1 in preterm labor with and without intra-amniotic inflammation.

Journal of perinatal medicine·2026
Same journal

Birth weight percentiles in infants with neonatal-onset prolonged neonatal hypoglycemia and persistent congenital hyperinsulinism.

Journal of perinatal medicine·2026
Same journal

Limits of viability: are we heading in right direction?

Journal of perinatal medicine·2026
See all related articles

Related Experiment Video

Updated: Apr 27, 2026

Modified MicroSecure Vitrification: A Safe, Simple and Highly Effective Cryopreservation Procedure for Human Blastocysts
09:35

Modified MicroSecure Vitrification: A Safe, Simple and Highly Effective Cryopreservation Procedure for Human Blastocysts

Published on: March 2, 2017

13.0K

The limits of viability

F A Chervenak1, L B McCullough

  • 1Department of Obstetrics and Gynecology, New York Hospital, Cornell Medical Center, NY, USA.

Journal of Perinatal Medicine
|January 1, 1997
PubMed
Summary
This summary is machine-generated.

This study ethically analyzes mortality and morbidity in very premature infants. It concludes that infant viability should be considered at 24 weeks gestation, not 23 weeks.

Keywords:
Professional Patient Relationship

More Related Videos

A Direct and Simple Method to Assess Drosophila melanogaster's Viability from Embryo to Adult
04:32

A Direct and Simple Method to Assess Drosophila melanogaster's Viability from Embryo to Adult

Published on: August 27, 2019

11.4K
Measuring Embryonic Viability and Brood Size in Caenorhabditis elegans
06:24

Measuring Embryonic Viability and Brood Size in Caenorhabditis elegans

Published on: February 24, 2023

5.5K

Related Experiment Videos

Last Updated: Apr 27, 2026

Modified MicroSecure Vitrification: A Safe, Simple and Highly Effective Cryopreservation Procedure for Human Blastocysts
09:35

Modified MicroSecure Vitrification: A Safe, Simple and Highly Effective Cryopreservation Procedure for Human Blastocysts

Published on: March 2, 2017

13.0K
A Direct and Simple Method to Assess Drosophila melanogaster's Viability from Embryo to Adult
04:32

A Direct and Simple Method to Assess Drosophila melanogaster's Viability from Embryo to Adult

Published on: August 27, 2019

11.4K
Measuring Embryonic Viability and Brood Size in Caenorhabditis elegans
06:24

Measuring Embryonic Viability and Brood Size in Caenorhabditis elegans

Published on: February 24, 2023

5.5K

Area of Science:

  • Neonatal Medicine
  • Medical Ethics
  • Perinatal Research

Background:

  • Very premature infants face significant risks of mortality and long-term morbidity.
  • Current guidelines on fetal viability are debated, impacting clinical and ethical decisions.
  • The divergence between survival rates and potential health complications necessitates ethical re-evaluation.

Purpose of the Study:

  • To conduct an ethical analysis of the divergence between mortality and potential morbidity in very premature infants.
  • To establish a gestational age threshold for viability based on ethical considerations.
  • To inform clinical practice and policy regarding the management of extremely preterm neonates.

Main Methods:

  • Ethical analysis framework applied to neonatal outcomes.
  • Review of current literature on preterm infant mortality and morbidity data.
  • Consideration of potential long-term health consequences and quality of life.

Main Results:

  • Significant ethical concerns arise from the divergence of mortality and morbidity risks at 23 weeks gestation.
  • Infants born at 23 weeks have a substantial risk of severe morbidity, challenging the definition of viability.
  • A gestational age of 24 weeks or greater is ethically supported as the threshold for viability.

Conclusions:

  • Current ethical standards support defining viability at 24 weeks gestation or later.
  • The potential for severe morbidity at 23 weeks outweighs the benefits of intervention based on ethical principles.
  • This ethical framework aims to guide decisions promoting the best interests of extremely preterm infants.