Reference — Pediatrics
Dehydration Severity Reference
A clinical quick reference for classifying pediatric dehydration severity — mild, moderate, and severe — using bedside assessment findings, with nursing priorities and fluid management principles for each level.
Educational use only. Dehydration severity classification guides initial management but individual assessment always applies. Fluid replacement volumes require provider orders and ongoing clinical reassessment. Follow current AAP and WHO rehydration guidelines and institutional protocols. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
Severity Classification — At a Glance
| Finding | Mild (3–5%) | Moderate (6–9%) | Severe (≥10%) |
|---|---|---|---|
| Mucous membranes | Slightly dry | Dry | Parched, cracked |
| Urine output | Slightly decreased; light yellow | Markedly decreased; dark amber | Minimal to none (oliguria/anuria) |
| Skin turgor | Normal; returns immediately | Decreased; slow return (<2 sec) | Tenting; very slow return (>2 sec) |
| Mental status | Alert, thirsty | Irritable, restless | Lethargic, limp, unresponsive |
| Eyes | Normal | Sunken; fewer tears | Markedly sunken; no tears |
| Anterior fontanelle | Normal (if applicable) | Sunken | Markedly sunken |
| Heart rate | Normal | Tachycardia | Marked tachycardia |
| Blood pressure | Normal | Normal to slightly reduced | Hypotension — LATE and critical |
| Capillary refill | ≤2 seconds | 2–3 seconds | >3 seconds |
| Weight loss estimate | 3–5% body weight | 6–9% body weight | ≥10% body weight |
Nursing Priorities by Severity
Mild Dehydration
- Oral rehydration therapy (ORT) — 50 mL/kg of oral rehydration solution over 2–4 hours
- Use Pedialyte or WHO ORS formula — not water, juice, or sports drinks
- Small, frequent sips (5–10 mL every 5 minutes) if vomiting
- Continue age-appropriate diet as tolerated
- Monitor wet diapers, urine output, and improvement in clinical signs
Moderate Dehydration
- Attempt ORT if tolerated; ondansetron (antiemetic) may facilitate oral rehydration if vomiting is the barrier
- Establish IV/IO access if ORT fails or child cannot tolerate oral intake
- Normal saline bolus 20 mL/kg IV over 20–30 minutes — reassess after each bolus
- Check electrolytes (Na, K, glucose, BUN, creatinine)
- Monitor vital signs, mental status, and urine output
Severe Dehydration
- Immediate IV/IO access — bolus 20 mL/kg isotonic saline; repeat until perfusion improves
- Assess perfusion after each bolus (HR, BP, capillary refill, mentation)
- Correct hypoglycemia immediately if present
- Replace ongoing losses (emesis, diarrhea) in addition to deficit and maintenance fluids
- Do not add potassium to IV fluids until urine output is established
- Consider ICU-level monitoring; identify and treat underlying cause
Key Assessment Points
- Weight is gold standard: 1 kg of weight loss = approximately 1 liter of fluid loss; weigh on admission and with each assessment
- Assess skin turgor on abdomen/inner thigh: Extremity skin is unreliable due to subcutaneous fat variation
- Sunken fontanelle: Present in dehydrated infants; bulging fontanelle indicates increased ICP — opposite clinical significance
- Tachycardia is the first sign: Children compensate with heart rate before losing blood pressure; hypotension is a late, pre-terminal finding
- Urine specific gravity: >1.020 indicates concentrated urine (dehydration); <1.005 = dilute urine (overhydration)
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with American Academy of Pediatrics (AAP) · CDC / ACIP (immunization schedule). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →