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Fetal viability is the ability of a human fetus to survive outside the uterus. Viability depends upon factors such as birth weight , gestational age, and the availability of advanced medical care . In low-income countries , more than 90% of extremely preterm newborns (less than 28 weeks gestational age ) die due to a lack of said medical care ...
Viability (fetal) Español: Existe una vesión en español, aquí: File:Prenatal_development_table_(es).svg Português: Versão em português: File:Prenatal development table pt.svg
Gestational age is the time that has passed since the onset of the last menstruation, which generally or as standard occurs 2 weeks before the actual fertilization. Embryonic age, in contrast measures the actual age of the embryo or fetus from the time of fertilization. Nevertheless, menstruation has historically been the only means of ...
In human reproduction, a live birth occurs when a fetus exits the mother showing any definite sign of life such as voluntary movement, heartbeat, or pulsation of the umbilical cord, for however brief a time and regardless of whether the umbilical cord or placenta are intact. [1] After the fetus is expelled from the maternal body it is called a ...
Hence, the gestational timing of a fetal toxin exposure, fetal drug exposure or vertically transmitted infection can be used to predict the potential consequences to the fetus. Estimated date of delivery; Scheduling prenatal care; Estimation of fetal viability; Calculating the results of various prenatal tests, (for example, in the triple test).
Long-term survival is possible after 22 weeks. [59] However, odds of long-term survival between 22 and 23 weeks are 2–3 percent and odds of survival between 23 and 24 weeks are 20 percent. [60] "Intact survival", which means survival of a neonate without subsequent damage to organs such as the brain or bowel is 1% at 22 weeks and 13% at 23 ...
Fetal mortality refers to stillbirths or fetal death. [9] It encompasses any death of a fetus after 20 weeks of gestation or 500 gm. In some definitions of the PNM early fetal mortality (week 20–27 gestation) is not included, and the PNM may only include late fetal death and neonatal death.
The chance of survival at 22 weeks is about 6%, while at 23 weeks it is 26%, 24 weeks 55% and 25 weeks about 72% as of 2016. [189] With extensive treatment up to 30% of those who survive birth at 22 weeks survive longer term as of 2019. [190] The chances of survival without long-term difficulties is less. [24]