Initial burn assessment
Key Points
- Reassess TBSA on arrival at the burn center; referring providers systematically overestimate, especially for burns under 20% TBSA [1][2]
- Overestimation of burn size drives overresuscitation -- correct the estimate before continuing calculated fluid rates [3]
- Deploy standardized digital estimation tools (Lund-Browder apps) to referring facilities and EMS to reduce variability at the point of first assessment [4][5]
- In pediatric patients, verify burn size estimates carefully as discrepancies have an outsized effect on weight-based fluid calculations [3]
Overview
Initial burn assessment is the clinical process of evaluating a burn patient in the first hour after injury, with total body surface area (TBSA) estimation as the single most consequential measurement. TBSA drives every subsequent decision in acute burn care: whether to transfer, how much fluid to give, and what resources to mobilize. Systematic reviews confirm that referring providers consistently overestimate burn size, with smaller burns disproportionately affected [1][2]. These errors compound into overresuscitation, unnecessary transfers, and misallocated resources downstream.
Assessment
TBSA estimation accuracy
Brekke et al. conducted a systematic review of clinical assessment agreement between referring units and burn centers, examining both %TBSA and burn depth accuracy across multiple studies [1]. Referring clinicians consistently overestimate %TBSA compared to burn center assessments, with smaller burns disproportionately overestimated. This pattern directly drives overresuscitation and inappropriate transfers [1].
Pham et al. reviewed the state of burn size estimation, analyzing sources of error and their downstream consequences for fluid resuscitation, referral decisions, and resource allocation [2]. TBSA miscalculations ranged widely regardless of provider experience level, with errors of clinical consequence occurring in a substantial proportion of referrals [2].
Pediatric considerations
Goverman et al. demonstrated that pediatric burn size overestimation led to significantly higher fluid volumes administered during initial resuscitation, increasing the risk of resuscitation-related complications [3]. In pediatric patients, discrepancies have an outsized effect on weight-based fluid calculations.
Digital estimation tools
Sritharan et al. found that while estimation accuracy had not improved substantially over time in their population, use of a standardized digital tool improved agreement between referring and receiving assessments [4]. The FireSync EMS application provided a structured interface for prehospital TBSA calculation that reduced variability in initial burn size documentation [5].
Controversies and Evidence Gaps
Most estimation accuracy studies compare referring assessments to burn center assessments as the gold standard, but burn center estimates themselves carry inter-rater variability. The clinical impact of overestimation on hard outcomes (mortality, organ failure) is inferred from physiology rather than directly measured. Digital tool studies are early-stage with limited adoption data [5]. Additional controversies include the relative accuracy of Lund-Browder charts versus the rule of nines, and the emerging role of digital photo-based TBSA tools.
References
[1] Brekke I et al. (2022). Agreement of clinical assessment of burn size and burn depth between referring units and burn centers. PMID: 35843804 [2] Pham C, Collier Z, Gillenwater J (2019). Changing the Way We Think About Burn Size Estimation. PMID: 30247559 [3] Goverman J et al. (2015). Discrepancy in Initial Pediatric Burn Estimates and Its Impact on Fluid Resuscitation. PMID: 25407387 [4] Sritharan K et al. (2023). Temporal trends in burn size estimation and the impact of the NSW Trauma App. PMID: 36878736 [5] Malkoff N, Gillenwater TJ et al. (2025). FireSync EMS: A Novel Mobile Application for Burn Surface Area Calculation. PMID: 39037208