Maintenance fluid volume requirements based on body weight are as follows:
| Volume per day | Volume per hour |
0–10 | 100 ml/kg | 4 ml/kg per hour |
10–20 | 1000 ml + 50 ml/kg for each kg > 10 | 40 ml + 2 ml/(kg > 10) |
20+ | 1500 ml + 20 ml/kg for each kg > 20 | 60 ml + 1 ml/(kg > 20) |
More accurate estimations of the maintenance requirements can be made if the surface area is known; 1500 ml per square metre of surface area is required.
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