Some ultrasounds can show that the water has broken, and there are direct and indirect signs during the ultrasound examination. Amniotic fluid rupture is a common language, but the technical term is amniotic membrane rupture. The rupture of the amniotic membrane is caused by the pressure in the uterine cavity that pushes the amniotic sac into the vagina, and then the pressure increases and ruptures, which is an indication of labor. Ultrasound is a common test to check the location of the rupture. If the location is deeper, for example, at full term, no direct signs can be seen and ultrasound cannot detect the rupture of the amniotic membrane. If the amniotic membrane is broken, the amniotic fluid will flow out, i.e. the dark area of amniotic fluid in the uterine cavity seen on ultrasound will decrease. The diagnosis of amniotic fluid rupture can be made by clinicians through internal examination, vaginal examination, and biological tests, but not directly by ultrasound. If you do not go to the obstetrics and gynecology department, you can use ultrasound to detect indirect signs and make inferences to suggest a diagnosis.