What IV fluid orders should be given for a patient with an 18% total body surface area burn?

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Last updated: September 29, 2026 • View editorial policy

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IV Fluid Orders for 18% TBSA Burn

For an adult patient with 18% TBSA burn, initiate resuscitation with 20 mL/kg of balanced crystalloid solution (Ringer's Lactate preferred) within the first hour, then calculate ongoing fluid requirements using 2-4 mL/kg/%TBSA over 24 hours (approximately 2880-5760 mL total for a 80 kg patient), with half given in the first 8 hours, titrated to urine output of 0.5-1 mL/kg/h. 1

Initial Resuscitation (First Hour)

  • Administer 20 mL/kg of balanced crystalloid immediately within the first hour of management 1

    • This addresses the early hypovolemic shock phase that occurs within the first 4 hours
    • No adjustment for TBSA is made initially due to difficulties in accurate assessment during the acute phase
    • For an 80 kg patient: 1600 mL in the first hour

  • Use Ringer's Lactate solution as first-line fluid 1

    • Balanced crystalloid solutions are preferred over 0.9% NaCl
    • 0.9% NaCl carries higher risk of hyperchloremic metabolic acidosis and acute kidney injury
    • Ringer's Acetate is an acceptable alternative, though less studied

Ongoing Fluid Resuscitation (First 24 Hours)

Calculate total 24-hour fluid requirement:

  • Use 2-4 mL/kg/%TBSA formula (Parkland formula range) 1
  • For 18% TBSA in 80 kg patient: 2880-5760 mL over 24 hours
  • Recent evidence favors starting at 2 mL/kg/%TBSA to reduce fluid overload complications 2, 3
    • Starting calculation: 2 mL × 80 kg × 18% = 2880 mL over 24 hours
    • Give half (1440 mL) in first 8 hours = 180 mL/hr for hours 1-8
    • Give remaining half (1440 mL) in next 16 hours = 90 mL/hr for hours 9-24

Critical caveat: The 2025 German Burn Registry study of 2235 patients found that exceeding the Parkland formula increases mortality, while under-resuscitation does not significantly affect mortality - "less seems to be better than more" 3. This strongly supports starting at the lower end (2 mL/kg/%TBSA).

Titration Strategy

Adjust fluid rates based on these endpoints (in order of importance):

  1. Urine output: Target 0.5-1 mL/kg/h (40-80 mL/hr for 80 kg patient) 1

    • This is the easiest and fastest parameter to monitor
    • Increase rate by 25-33% if urine output falls below 0.5 mL/kg/h
    • Decrease rate by 25-33% if urine output exceeds 1 mL/kg/h

  2. Additional monitoring parameters:

    • Arterial lactate concentration (normalize lactate)
    • Mean arterial pressure (maintain >65 mmHg)
    • Heart rate (decreasing trend indicates adequate resuscitation)
    • Mental status in non-intubated patients

  3. Consider advanced monitoring if persistent instability:

    • Echocardiography for cardiac function assessment
    • Intra-abdominal pressure monitoring (recommended by ABA 2024) 2
    • Intraocular pressure monitoring (recommended by ABA 2024) 2

Albumin Consideration

For this 18% TBSA burn, albumin is NOT routinely indicated 1

  • Albumin is suggested only for burns >30% TBSA after the first 6 hours
  • If albumin were indicated (for larger burns), target serum albumin >30 g/L with doses of 1-2 g/kg/day
  • This reduces crystalloid volumes and complications like abdominal compartment syndrome

Vascular Access

  • Obtain IV access immediately, preferably in unburned areas 1
  • If peripheral IV cannot be obtained rapidly: use intraosseous route 1
  • Central femoral venous access is last resort 1

Common Pitfalls to Avoid

  1. Fluid creep (over-resuscitation): Associated with increased morbidity including ARDS, acute kidney injury, and abdominal compartment syndrome 1

    • Monitor for excessive urine output (>1 mL/kg/h)
    • Recent data strongly supports avoiding over-resuscitation 3

  2. Delayed resuscitation: Early fluid administration (within 2 hours) reduces morbidity and mortality 1

  3. Using 0.9% NaCl: Increases risk of hyperchloremia and metabolic acidosis 1

  4. Rigid adherence to formulas: Formulas provide starting points only - must titrate to clinical response 1

    • The 2019 study showed actual fluid given was significantly less than Parkland calculations when titrated to urine output 4

  5. Ignoring fluid balance: Positive fluid balance on Day 3 correlates with longer mechanical ventilation and hospital stay 1

Contraindications

Never use hydroxyethyl starches - contraindicated by European Medicines Agency and ANSM in severe burns 1

Practical Order Set Example (80 kg patient, 18% TBSA)

Hour 0-1: Ringer's Lactate 1600 mL IV bolus (20 mL/kg)
Hours 1-8: Ringer's Lactate 180 mL/hr IV
Hours 9-24: Ringer's Lactate 90 mL/hr IV
Titrate: Adjust rate by 25-33% to maintain urine output 40-80 mL/hr (0.5-1 mL/kg/h)
Monitor: Hourly urine output, vital signs q1h, lactate q4h

References

2
Research

American Burn Association Clinical Practice Guidelines on Burn Shock Resuscitation.

Journal of burn care & research : official publication of the American Burn Association, 2024

4
Research

Effectiveness of Parkland formula in the estimation of resuscitation fluid volume in adult thermal burns.

Chinese journal of traumatology = Zhonghua chuang shang za zhi, 2019

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This information is intended for healthcare professionals. Any medical decision-making should rely on clinical judgment and independently verified information. The content provided herein does not replace professional discretion and should be considered supplementary to established clinical guidelines. Healthcare providers should verify all information against primary literature and current practice standards before application in patient care. Dr.Oracle assumes no liability for clinical decisions based on this content.