Medical Diagnostics & Clinical Scoring

ABSI (Burn Severity Index)

Calculate the Abbreviated Burn Severity Index (ABSI) to predict burn patient mortality and guide clinical triage and fluid resuscitation.

ABSI Score
3
Threat to LifeLow (< 2%)

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ABSI Overview

The Abbreviated Burn Severity Index (ABSI) is a rapid, five-variable scoring system utilized in emergency departments and burn centers to predict the probability of survival for patients suffering from severe thermal injuries.

The Five Predictors of Mortality

Unlike complex, heavily computerized models, the ABSI relies on five easily obtainable variables that heavily dictate burn shock and mortality:

  1. Sex: Females historically have slightly higher mortality rates in severe burn injuries.
  2. Age: Extremes of age, particularly the elderly, lack the physiological reserve to survive massive fluid shifts and hypermetabolism.
  3. Inhalation Injury: Smoke inhalation damages lung parenchyma, causes ARDS, and dramatically multiplies mortality risk.
  4. Full-Thickness Burn: The presence of third-degree burns indicates deep tissue destruction and higher risk of sepsis.
  5. TBSA (Total Body Surface Area): The total percentage of the body affected by second and third-degree burns.

ABSI Score &= Sex Points \ &\quad + Age Points \ &\quad + Inhalation Points \ &\quad + Full \ &\quad -Thickness Points \ &\quad + TBSA Points

Frequently Asked Questions

The score maps directly to a predicted survival probability. A score of 2-3 indicates a >99% chance of survival. A score of 8-9 drops survival to about 50%, while a score of 12 or higher indicates a <10% chance of survival.

Yes, the ABSI is incredibly useful for triage. Patients with scores of 6 or higher generally require transfer to specialized, high-acuity tertiary burn centers, while those with lower scores might be managed safely in local surgical units.

No, but it does shift the curve. Because of massive advances in critical care, early excision/grafting, and fluid resuscitation, modern survival rates at high ABSI scores are actually much better than what the original 1980s data predicted. However, the score remains an excellent tool for stratifying relative risk.

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