Final answer:
The fern test is used to confirm the rupture of the amniotic membranes, which is characterized by a fern-like pattern in the vaginal fluid.
Step-by-step explanation:
The test performed to determine if membranes are ruptured is the fern test. This test involves examining the vaginal fluid under a microscope to identify a fern-like pattern, which is indicative of the presence of amniotic fluid. The fern test is significant in confirming the rupture of the amniotic membranes, which can occur spontaneously as spontaneous rupture of membranes (SROM) or prematurely as premature rupture of membranes (PROM), including cases of preterm premature rupture of membranes (PPROM). In PROM or PPROM, the onset of labor typically begins within 48 hours, and appropriate medical attention is important to prevent infections.