<prompt> Currently, the threshold of bility lies between20 and 26 weeks24 and 28 weeks26 and 30 weeks28 and 30 weeks  <response>: Threshold of ViabilityBihs once considered to be abouses because the fetus weighed 500 g are now classified as live bihs. For those newborns delivered before 33 weeks gestation, perinatal and neonatal care has advanced tremendously. As a result, the threshold of bility, which is the lower limit of fetal maturation compatible with extrauterine survival, has been reassessed. Currently, the threshold of bility lies between 20 and 26 weeks gestationReference: Williams Obstetrics; 25th edition; Chapter 42; Preterm bih 