The duration of an intravenous infusion can be roughly measured by the drip rate of the infuser. x4 drops per minute of the infuser can be converted to a specific number of milliliters of the total amount of fluid entered into the patient’s body per hour, e.g., if the infuser is 25 drops per minute, the patient’s infusion of 100 ml of fluid per hour can be measured. However, the total amount of fluid input can vary with different infusion sets and the size of each drop of the infusion set. Sometimes it depends on the patient’s condition to decide how fast or slow to enter the fluid, if the patient belongs to hemorrhagic shock, the blood pressure is very low, the heart rate is very fast, and needs a large amount of rehydration, rapid rehydration when the amount of fluid needs to be entered more quickly. Sometimes the concentration of the fluid to be given is large, for example, fat milk, which can cause pain in the patient’s blood vessels when given quickly, so the fluid should be given slowly.