1, hypertonic water loss; If the patient is in shock, sodium chloride injection should be given first, and colloid should be supplemented as appropriate.

2. Isoosmotic water loss; In principle, isotonic solution, 9% sodium chloride injection or compound sodium chloride injection are given.

3. Low infiltration water loss; When the blood sodium is lower than 1.20 mmol/L, 3% ~ 5% sodium chloride injection can be given slowly. When the blood sodium rises above 120 ~ 125 mmol/L, isotonic solution can be used or hypertonic glucose injection can be added to the isotonic solution as appropriate.

4, low chlorine metabolic alkalosis, give 9% sodium chloride injection or compound sodium chloride injection (Ringer's solution) 500 ~ 1000 ml, and then decide the dose according to the alkalosis.

5, external use of physiological saline to wash eyes, wash wounds, etc. ; It can also be used to induce labor by water bag in obstetrics.