Calculate the fluid need (in mL) of an adult weighing 88 kg whohas a fever of 102.6° F. The patient is able to tolerate food andfluids.
There is a standard formula for daily fluid intake:
100 mL/kg for the first 10 kg of weight
50 mL/kg for the next 10 kg of weight
15 mL/kg for the remaining kg
Example:
Adult weighs 85 kg
10 kg X 100 mL/kg = 1000 mL
10 kg X 50 mL/kg = 500 mL
15 mL/kg X 65 kg = 975 mL
Total fluid needs = 2475 mL
This standard formula includes fluid that is contained in foods.To determine how much liquid alone an adult needs to consume,multiply the daily fluid intake by 75%.
Therefore, an 85-kg adult who is able to consume food and fluidswould have a daily fluid intake need of:
2475 mL X 75% =
2475 mL x 0.75 = 1856.25 or 1856 mL of fluid/day
As noted earlier, patients with a fever will need an increase intheir fluid intake by 6% for each degree over normal bodytemperature (98.6° F). If the 85 kg patient had a temperature of100.6°, he would need a 12% increase in fluids or:
1856 mL X 12% =
1856 X 0.12 = 222.72 mL or 223 mL additional fluids
1856mL + 223 mL = 2079 mL fluid/day
