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Table 4 Oral rehydration solution (ORS) dosages recommended for each dehydration subgroup.

From: Guidelines on acute gastroenteritis in children: a critical appraisal of their quality and applicability in primary care

No dehydration Mild to moderate dehydration Severe dehydration Evidence used
Prevention of dehydration: ± § Φ Rehydration: $*± § Φ   
• 100 ml ORS/kg per 24 h for the 1st 10 kg of body weight± • 30-80 ml ORS/kg/h over 4 hours±   
50 ml/kg/day for the next 10 kg± • 50-100 ml ORS/kg over 3-4 hours#*$   
20 ml/kg/day for remaining kg± • 50 ml ORS/kg over 4 hours§   
• 5 ml ORS/kg after each large watery stool§ • 10-25 ml ORS/kg/hour in 4 hours Φ   
• 10 ml ORS/kg after each large watery stool Φ    
  Maintenance± §   
Ongoing losses: $#* • 100 ml ORS/kg per 24 h for the 1st 10 kg of body weight   
• ORS$ 50 ml ORS/kg/day for the next 10 kg Refer to hospital No evidence stated for ORS dosage $#*± § Φ
• < 10 kg bodyweight: 60-120 ml ORS for each stool/vomit#* 20 ml ORS/kg/day for remaining kg±   
> 10 kg bodyweight: 120-240 ml ORS for each stool/vomit# • < 10 kg weight: 100 ml ORS/kg/day   
  10-20 kg weight: 1000 ml + 50 ml/kg for each kg > 10   
  20+kg weight: 1500 ml + 20 ml/kg for each kg > 20§   
  Ongoing losses: $#*§   
  • Replace with ORS$   
  • 10 ml ORS/kg per stool/vomit ±   
  • < 10 kg bodyweight: 60-120 ml ORS for each stool/vomit#*   
  > 10 kg bodyweight:120-240 ml ORS for each stool/vomit#   
  • 5 ml/kg ORS after each large watery stool§   
  1. *WGO # CDC $CPS ± ARM
  2. CCH ΦNHG ΨESP §NICE