WHO guidelines for assessment of dehydration

No dehydration (<5%)	Some dehydration (5 to 10%)	Severe dehydration (>10%)
No dehydration (<5%)	Two or more of the following signs:	Two or more of the following signs:
Well, alert	Restlessness, irritability	Lethargy or unconsciousness
Normal eyes	Sunken eyes	Sunken eyes
Drinks normally, not thirsty	Thirsty, drinks eagerly	Unable to drink or drinks poorly
Skin pinch goes back quickly	Skin pinch goes back slowly	Skin pinch goes back very slowly (≥2 seconds)
Estimated fluid deficit: <50 mL/kg	Estimated fluid deficit: 50 to 100 mL/kg	Estimated fluid deficit: >100 mL/kg

Reference:

Updated Guideline: Paediatric Emergency Triage, Assessment and Treatment: Care of Critically Ill Children. World Health Organization 2016. Available at https://apps.who.int/iris/handle/10665/204463 (Accessed on September 12, 2023).

Graphic 68271 Version 6.0