Fetal viability - Wikipedia, the free encyclopedia


** Fetal viability **

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*Fetal viability* is the ability of a fetus to survive outside the


· 1 Definitions
· 2 Scientific thresholds

· 2.1 Legal definitions

· 2.1.1 United States

· 3 Limit of viability
· 4 Factors that influence the chance of survival
· 5 See also
· 6 References
· 7 Footnotes


The potential of the fetus to survive outside the uterus after birth,
natural or induced. Fetal viability depends largely on the fetal organ
maturity, and environmental conditions.^[2]

According to Websters Encyclopedic Unabridged Dictionary of the English
Language, viability of a fetus means having reached such a stage of
development as to be capable of living, under normal conditions, outside
the uterus. Viability exists as a function of biomedical and technological
capacities, which are different in different parts of the world. As a
consequence, there is, at the present time, no worldwide, uniform
gestational age that defines viability.^[3]

*Scientific thresholds[edit]*

There is no sharp limit of development, age, or weight at which a human
fetus automatically becomes viable.^[1] According to studies between 2003
and 2005, 20 to 35 percent of babies born at 23 weeks of gestation survive,
while 50 to 70 percent of babies born at 24 to 25 weeks, and more than 90
percent born at 26 to 27 weeks, survive.^[4] It is rare for a baby weighing
less than 500g (17.6 ounces) to survive.^[1] A baby's chances for survival
increases 3-4% per day between 23 and 24 weeks of gestation and about 2-3%
per day between 24 and 26 weeks of gestation. After 26 weeks the rate of
survival increases at a much

Source: en.wikipedia.org/wiki/Fetal_viability

when are babies viable

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