Dehydration Treatment Guidelines

Assessment and Treatment

The American Academy of Pediatrics and the World Health Organization recommend assessing the severity of dehydration based on clinical signs including pulse, perfusion, mental status, skin turgor, and presence of sunken eyes 1, 2
For older adults, measured serum or plasma osmolality >300 mOsm/kg indicates dehydration, according to the American Geriatrics Society 3, 4
The Centers for Disease Control and Prevention recommend evaluating for specific causes of dehydration to guide appropriate treatment 1, 3
Reduced osmolarity oral rehydration solution is the first-line therapy for mild to moderate dehydration in infants, children, and adults, as recommended by the World Health Organization 5, 6, 1
Isotonic intravenous fluids such as lactated Ringer's and normal saline should be administered for severe dehydration, shock, altered mental status, or when oral rehydration therapy fails, according to the American College of Emergency Physicians 5, 1, 2

The World Health Organization recommends oral rehydration therapy with reduced osmolarity ORS as first-line therapy for mild to moderate dehydration, with dosing of 50-100 mL after each stool for children <2 years, 100-200 mL after each stool for older children, and as much as needed for adults 6, 1, 2, 7, 8
Nasogastric administration of ORS should be considered for patients who cannot tolerate oral intake or refuse to drink adequately, at a rate of 15 mL/kg body weight/hour for infants, as recommended by the American Academy of Pediatrics 6, 1, 7, 8
Intravenous rehydration with isotonic fluids such as lactated Ringer's or normal saline should be used for severe dehydration, with continuation until pulse, perfusion, and mental status normalize, according to the American College of Emergency Physicians 5, 1, 2

The American Geriatrics Society recommends encouraging increased fluid intake with preferred beverages for older adults with dehydration who appear well, and offering subcutaneous or intravenous fluids in parallel with oral intake for those who appear unwell 3, 4
Subcutaneous dextrose infusions can be effective with similar adverse effect rates as IV infusion for older adults, according to the American Geriatrics Society 3, 4

The World Health Organization recommends administering maintenance fluids and replacing ongoing losses once rehydrated, and continuing oral rehydration therapy to replace ongoing losses until diarrhea and vomiting resolve 1, 2
Human milk feeding should be continued in infants throughout the diarrheal episode, as recommended by the American Academy of Pediatrics 1, 2
Age-appropriate diet should be resumed during or immediately after rehydration, according to the American Academy of Pediatrics 1, 2

The Centers for Disease Control and Prevention recommend reassessing hydration status after 3-4 hours of treatment, and continuing treatment according to degree of dehydration at reassessment 7, 8
Monitoring for signs of worsening condition, such as continued high stool output, persistent thirst, sunken eyes, and fever, is crucial, as recommended by the World Health Organization 7, 8
For severe cases, monitoring vital signs, mental status, and laboratory parameters as needed is recommended by the American College of Emergency Physicians 1, 2

The presence of 4 or more signs, including extremity weakness, dry mucous membranes, dry or furrowed tongue, and severe postural dizziness, indicates moderate to severe dehydration in patients with volume depletion from prolonged vomiting, as recommended by the Clinical Nutrition society 9, 10
Severe postural dizziness, confusion or altered mental status, and signs of severe dehydration are red flags requiring immediate medical attention, according to the Clinical Nutrition society 9, 10

Avoiding caffeine, alcohol, fatty or spicy foods is crucial in managing dehydration, as suggested by the Alimentary Pharmacology and Therapeutics society 11
The use of antiemetics like serotonin (5-HT3) antagonists or dopamine antagonists can significantly reduce nausea and vomiting, allowing for oral rehydration, as recommended by the Clinical and Molecular Hepatology society 12

Inability to keep down any fluids for more than 24 hours, severe abdominal pain or distension, persistent high fever, and frank blood in vomit or stool are red flags requiring immediate medical attention, as indicated by the Alimentary Pharmacology and Therapeutics society 11
Severe postural dizziness preventing standing, confusion or altered mental status, and signs of severe dehydration are also red flags, according to the Clinical Nutrition society 9, 10