Dehydration Treatment Guidelines

Introduction to Dehydration Treatment

The American Academy of Pediatrics and the World Health Organization recommend reduced osmolarity oral rehydration solution (ORS) containing 50-90 mEq/L sodium as the first-line treatment for mild to moderate dehydration in all age groups 1, 2
For severe dehydration with shock or altered mental status, the American College of Emergency Physicians recommends isotonic intravenous fluids (lactated Ringer's or normal saline) 1, 2

For mild dehydration (3-5% fluid deficit), administer ORS containing 50-90 mEq/L sodium at 50 mL/kg over 2-4 hours, as recommended by the Centers for Disease Control and Prevention 3, 4
For moderate dehydration (6-9% fluid deficit), use the same ORS formulation but increase volume to 100 mL/kg over 2-4 hours, as suggested by the World Health Organization 3, 4
For severe dehydration (≥10% fluid deficit, shock, or altered mental status), administer 20 mL/kg boluses of lactated Ringer's solution or normal saline until pulse, perfusion, and mental status normalize, as recommended by the American College of Emergency Physicians 1, 3

Breastfed infants must continue nursing on demand throughout the illness, as recommended by the American Academy of Pediatrics 1, 3
Bottle-fed infants should receive full-strength, lactose-free or lactose-reduced formulas immediately upon rehydration, as suggested by the Centers for Disease Control and Prevention 3, 2
Older adults with low-intake dehydration should be encouraged to increase intake of preferred beverages, but not oral rehydration therapy or sports drinks, as recommended by the American Geriatrics Society 8, 9

Monitor pulse, perfusion, mental status, urine output, and body weight during treatment, as recommended by the American College of Emergency Physicians 1, 3
In severe cases with renal or cardiac compromise, monitor serum osmolality and perform frequent cardiac, renal, and mental status assessments to avoid fluid overload, as suggested by the National Kidney Foundation 2