The age of viability is the time when the preterm newborn

The age of viability is the age of gestation of the fetus wherein, when born preterm, will live outside the uterus. As a rule, preterm neonates (less than 37 weeks age of gestation) has a high chance of not surviving after birth. This risk increases as age of gestation decreases. Usually, preterms born at less than 28 weeks of gestation has a very high chance of death.