What is defined as the rupture of membranes before the onset of labor?

The definition of the rupture of membranes before the onset of labor is known as Premature Rupture of Membranes (PROM). This condition occurs when the amniotic sac breaks prior to the start of contractions, leading to a range of clinical considerations for both the mother and the fetus. This can pose risks such as infection and complications related to preterm birth, as the membranes are critical for protecting the fetus and maintaining the amniotic environment.

In contrast, spontaneous labor refers to the natural onset of labor processes without any medical intervention, while induced labor is when medical methods are used to stimulate contractions artificially. Transitional labor is not a recognized standard term in obstetrics; rather, it often describes a specific phase within the active labor process, making these choices less applicable in the context of membrane rupture. Therefore, the correct option accurately conveys the medical understanding of ruptured membranes prior to labor.