Definition:
A doctor will say that a pregnancy is "viable" if there are no indicators of miscarriage and there is a reasonable expectation that the pregnancy will result in the birth of a live infant. A nonviable pregnancy would be a pregnancy in which there is no chance of a live infant being born, such as an ectopic pregnancy, a molar pregnancy, or a pregnancy in which the baby no longer has a heartbeat.
The term "age of viability" refers to the point in pregnancy at which the baby could have a chance of survival if born prematurely, which is generally around 24 weeks of pregnancy.
