TBSA Thresholds for Hospital Admission in Partial-Thickness Burns
Adults with partial-thickness burns exceeding 10% TBSA and children with partial-thickness burns exceeding 5–10% TBSA require hospital admission, with mandatory burn center referral for specialized multidisciplinary care. 1, 2
Adult Admission Criteria
Admit adults to a burn center when partial-thickness burns involve >10% TBSA. 1, 2 This threshold reflects the need for:
- Intravenous fluid resuscitation (initiated at 20 mL/kg within the first hour for burns ≥15% TBSA, then adjusted using the Parkland formula) 3
- Specialized wound care requiring deep analgesia or general anesthesia 1
- Monitoring for systemic complications including respiratory, cardiocirculatory, metabolic, and renal dysfunction 4
Historical data support this 10% cutoff: one older study noted that hospitalization is "usually necessary for adults with burns larger than 10% of the total body surface area" 5, and this threshold has been consistently reinforced in contemporary guidelines 1, 2.
Pediatric Admission Criteria
Children require burn center admission when partial-thickness burns exceed 5–10% TBSA. 1, 2 The lower threshold in children accounts for:
- Higher body surface area-to-weight ratio necessitating greater total fluid intake (approximately 6 mL/kg/% TBSA over 48 hours) 3
- Increased risk of hypothermia during cooling or resuscitation 1
- Age-specific TBSA calculation requirements using the Lund-Browder chart (pediatric version), as the Wallace rule of nines significantly overestimates TBSA in children 3, 1
Infants under 1 year of age require burn center referral regardless of TBSA percentage. 1
Additional Mandatory Referral Criteria (Regardless of TBSA)
Even if TBSA falls below the 10% (adult) or 5–10% (child) threshold, immediate burn center referral is required for partial-thickness burns involving:
- Face, hands, feet, genitals, perineum, or flexure lines 1, 2
- Circumferential burns causing compartment syndrome 1
- Any electrical or chemical mechanism 1, 6
- Concomitant inhalation injury (facial burns, singed nasal hairs, carbonaceous sputum) 1
- Patients over 75 years with comorbidities and TBSA >10% 6
Critical Pitfalls to Avoid
Do not rely on the Wallace rule of nines for TBSA estimation, especially in children—it overestimates TBSA in 70–94% of cases, leading to fluid overresuscitation and inappropriate resource utilization. 3 Instead, use the Lund-Browder chart as the gold standard for accurate measurement. 3, 1
Do not delay burn center consultation while attempting outpatient management of function-sensitive area burns (hands, feet, face, genitals), as these require specialist assessment regardless of size. 2
Avoid secondary transfers when possible—direct admission to a burn center is associated with improved survival, fewer complications, shorter hospital stays, and lower costs compared to initial management at a non-specialized facility followed by transfer. 1
Practical Implementation
When assessing TBSA at the scene or in the emergency department:
- Use the Lund-Browder chart for accurate measurement 3, 1
- Alternatively, use the patient's open hand (palm plus fingers = 1% TBSA) for scattered burns 3
- Smartphone applications (e.g., E-Burn) can facilitate accurate TBSA calculation 3
- Repeat TBSA assessment during initial management, as burns evolve in appearance over the first few days and initial estimates are frequently inaccurate, particularly for small burns (often overestimated) and large burns (often underestimated) 3, 7
Contact a burn specialist immediately to confirm severity, guide fluid resuscitation, and determine the need for transfer, as specialist management is associated with better survival and reduced morbidity. 3, 1