Generally, it should not exceed 24 hours after the normal saline is opened.
Too long time will lead to bacterial infection in brine. It can be kept in the refrigerator for a certain time, but it can't be kept for a long time. Otherwise, once infected, it is very dangerous.
Normal saline is a sodium chloride solution whose osmotic pressure is basically equal to that of animal or human plasma, which is often used in physiological experiments or clinic.
Concentration: 0.67 ~ 0.70% for amphibians and 0.85 ~ 0.9% for mammals and humans.
People usually use sodium chloride injection for intravenous drip (intravenous drip) with a concentration of 0.9%, which can be used as normal saline. Its osmotic pressure is similar to that of human blood, and its sodium content is similar to that of plasma, but its chlorine content is obviously higher than that of plasma, so physiological saline is only relatively physiological, and its purpose is to supply electrolytes and maintain the tension of body fluids.
It can also be used externally, such as cleaning wounds or dressing changes. 0.9% sodium chloride solution (physiological saline) can maintain the normal morphology of cells.
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