sensible and insensible fluid losses

Insensible losses (nonmeasurable)

• Lungs: 200 mL
• Skin: 600 mL
• Sweat: Variable

Sensible losses (measurable)

• Fecal: 200 mL
• Urine: 800 to 1500 mL

These losses account for 2000 to 2500 mL/day, giving a 24-hour fluid requirement of 30 to 35 mL/kg to maintain normal fluid balance.