👤 By the CinnaRN Clinical Content Team🕐 Updated 2026-08-23🏷️ Physiological Adaptation🔖 Free to read, print, and share
Also known as: fluid loss in kids · dry baby · volume depletion · not enough fluids
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Use this quick-reference guide to spot, treat, and prevent Pediatric Dehydration on the NCLEX. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
🩺 Signs
↓ urine, no tears, dry mucosa
Sunken fontanel + eyes
Poor skin turgor, ↑ cap refill
🧪 Labs
Urine sp. gravity > 1.030
↑ BUN, ↑ Hct, watch Na+/K+
✅ Do
Oral rehydration solution first
IV fluids if severe, weigh daily
Strict I&O, daily weights
🚩 Report
Best indicator = weight loss
Lethargy, ↓ BP, shock
📚 Pediatric Dehydration — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what must be reported, and what to teach.
Pediatric dehydration is excess loss or inadequate intake of body fluid, most often from vomiting and diarrhea, and is a major cause of childhood illness and death worldwide. Infants and young children dehydrate faster than adults because they have a higher body-water percentage, higher metabolic rate, and greater body-surface-area-to-weight ratio. Severity is classified as mild, moderate, or severe based on weight loss and clinical signs; weight is the most accurate indicator.
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Key points
Understand these first
Early signs include dry mucous membranes, decreased urine output, no tears when crying, and irritability.
A sunken anterior fontanelle in infants and sunken eyes indicate significant fluid loss.
Tachycardia is an early compensatory sign; hypotension is a late and ominous sign in children.
Weight loss quantifies severity: mild about 3-5%, moderate about 6-9%, severe 10% or more.
Decreased level of consciousness and minimal or absent urine output mark severe dehydration.
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Nursing priorities
What to do, in order
Assess hydration status: weigh the child, check fontanelle, mucous membranes, skin turgor, capillary refill, and urine output.
For mild-to-moderate dehydration, give oral rehydration solution in small frequent amounts.
For severe dehydration or shock, establish IV access and give isotonic fluid boluses (normal saline or lactated Ringer's) as ordered.
Monitor strict intake and output, daily weights, and vital signs frequently.
Identify and treat the underlying cause and correct electrolyte imbalances as ordered.
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Red flags — report now
Escalate immediately
Lethargy, no urine output for many hours, sunken fontanelle, or absent tears signal severe dehydration.
Hypotension, weak pulses, mottled or cold extremities, and altered consciousness indicate impending hypovolemic shock.
Continued vomiting that prevents oral intake requires escalation to IV rehydration.
Never delay IV fluid resuscitation in a child showing signs of shock.
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Labs & values
Numbers to know
Sodium: normal 135-145 mEq/L
Potassium: normal 3.5-5.0 mEq/L
BUN: normal 7-20 mg/dL, often elevated with dehydration
Urine specific gravity: normal 1.005-1.030, elevated with dehydration
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Patient teaching
What patients must know
Offer oral rehydration solution rather than plain water, juice, or soda during diarrhea and vomiting.
Continue breastfeeding or formula; give small frequent sips to avoid triggering more vomiting.
Watch for and report fewer wet diapers, no tears, dry mouth, sunken eyes, or unusual sleepiness.
Seek care promptly for ongoing vomiting, bloody stools, or signs of worsening dehydration.
❓ Pediatric Dehydration: NCLEX FAQs
What are the priority nursing interventions for Pediatric Dehydration?
Assess hydration status: weigh the child, check fontanelle, mucous membranes, skin turgor, capillary refill, and urine output. For mild-to-moderate dehydration, give oral rehydration solution in small frequent amounts. For severe dehydration or shock, establish IV access and give isotonic fluid boluses (normal saline or lactated Ringer's) as ordered. Monitor strict intake and output, daily weights, and vital signs frequently.
What are the warning signs of Pediatric Dehydration a nurse must report?
Lethargy, no urine output for many hours, sunken fontanelle, or absent tears signal severe dehydration. Hypotension, weak pulses, mottled or cold extremities, and altered consciousness indicate impending hypovolemic shock. Continued vomiting that prevents oral intake requires escalation to IV rehydration. Never delay IV fluid resuscitation in a child showing signs of shock.
What do I need to know about Pediatric Dehydration for the NCLEX?
Early signs include dry mucous membranes, decreased urine output, no tears when crying, and irritability. A sunken anterior fontanelle in infants and sunken eyes indicate significant fluid loss. Tachycardia is an early compensatory sign; hypotension is a late and ominous sign in children. Prolonged capillary refill (over 2-3 seconds), poor skin turgor, and cool mottled extremities suggest moderate-to-severe dehydration.
What patient teaching is important for Pediatric Dehydration?
Offer oral rehydration solution rather than plain water, juice, or soda during diarrhea and vomiting. Continue breastfeeding or formula; give small frequent sips to avoid triggering more vomiting. Watch for and report fewer wet diapers, no tears, dry mouth, sunken eyes, or unusual sleepiness. Seek care promptly for ongoing vomiting, bloody stools, or signs of worsening dehydration.
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Quick Tip
Early signs include dry mucous membranes, decreased urine output, no tears when crying, and irritability.