Premature rupture of membranes refers to the rupture of the membranes before labor, characterized by intermittent discharge of amniotic fluid from the vagina. To diagnose premature rupture of membranes, it is necessary to combine the patient's clinical symptoms with objective examinations. However, this does not mean that amniotic fluid will continuously leak after the membranes rupture. The leakage of amniotic fluid in cases of premature rupture of membranes is intermittent, primarily because many patients choose to rest in bed after the rupture. When lying flat, the amniotic fluid will not continuously leak out and may come out in spurts at times. Therefore, the belief that amniotic fluid will continuously leak following premature rupture of membranes is incorrect; intermittent leakage can also indicate a rupture. If premature rupture of membranes cannot be diagnosed based on the vaginal discharge alone, pH test strips may be used to test the fluid. If the pH test strip changes color, it can confirm the diagnosis of premature rupture of membranes.