What is the hourly maintenance fluid requirement for an 80-kg male?

To determine the hourly maintenance fluid requirement for an 80-kg male, the commonly used method is the "4-2-1 rule," which helps to calculate the hourly fluid needs based on body weight. According to this guideline, the first 10 kg of body weight accounts for 4 mL/kg/h, the next 10 kg accounts for 2 mL/kg/h, and any weight above 20 kg is calculated at 1 mL/kg/h.

For an 80-kg individual:

• The first 10 kg: 10 kg × 4 mL/kg/h = 40 mL/h

• The next 10 kg: 10 kg × 2 mL/kg/h = 20 mL/h

• The remaining 60 kg (80 kg - 20 kg): 60 kg × 1 mL/kg/h = 60 mL/h

Now, summing these amounts:

40 mL/h + 20 mL/h + 60 mL/h = 120 mL/h

This calculation indicates that the hourly maintenance fluid requirement for an 80-kg male is indeed 120 mL/h. This comprehensive approach accounts for the varying requirements based on weight and provides a