The distinction between amniotic fluid and secretions can be made by traits, pH, symptoms, vaginal fluid smears, and laboratory tests. 1. Characteristics: Amniotic fluid is slightly turbid watery, opaque, and may contain small flakes such as fetal fat. Vaginal secretions are white, thin and pasty or egg-white, thick, but without a fishy odor. 2. pH: amniotic fluid has a pH of 7.0-7.5, while vaginal secretion has a pH of 4.5-6.0. pH test paper can be used to detect when the paper turns blue, indicating that it is amniotic fluid, and when it does not change color, suggesting that it is vaginal secretion. 3. Symptoms: When premature rupture of membranes occurs, it can be manifested as sudden vaginal discharge of more fluid, and the amount of fluid increases when the abdominal pressure is increased, and the amount of vaginal discharge increases when the vaginal examination is performed and the prenatal prelude is pushed up. Vaginal secretions are not affected by changes in abdominal pressure and increase in outflow. 4. Smear of vaginal fluid: when premature rupture of membranes occurs, the smear of the fluid at the posterior vaginal vault may show amniotic plant-like crystals, while the smear of vaginal secretion does not show this phenomenon. 5. Laboratory examination: take vaginal fluid for biochemical examination, such as insulin-like growth factor binding protein-1, soluble intercellular adhesion molecule-1 test, etc., when the result is positive, it can be clear that it is amniotic fluid, while vaginal secretion does not detect the above biochemical indexes.