13 Emergency Medicine & Critical Care Calculators – Acute Assessment & Severity
Emergency and critical-care calculators cover acute disease-specific assessment, general severity and organ dysfunction, sepsis and systemic response, neurologic and sedation assessment, and hemodynamics, burns, and resuscitation arithmetic.
Each tool uses its own population, observation window, measurement definitions, and unavailable-data rules. A point total or arithmetic result from one instrument cannot be substituted for another.
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Choose a calculator by task
Use the task groups below to find the calculator whose formula, intended population, required measurements, and purpose match the task.
Acute disease-specific assessment
Choose Wells PE, CURB-65, PSI/PORT, or BISAP only for the stated suspected or established acute disease context and its defined inputs.
Critical illness severity & organ dysfunction
Use APACHE II or classic SOFA-1 only with the measurements, time window, organ-support definitions, and population stated by that model.
Sepsis & systemic response
Use adult qSOFA or historical adult SIRS as limited prompts, not as independent sepsis diagnoses or universal screening rules.
Neurologic & sedation assessment
Choose GCS for its eye, verbal, and motor assessment or RASS for the adult ICU observation-to-stimulation sequence.
Hemodynamics, burns & resuscitation
Use traditional shock index, adult Rule-of-Nines TBSA, or classic Parkland arithmetic only with the measurements, assumptions, and formula limits stated on each page.
How to choose a calculator in this category
- Confirm whether the task is disease-specific assessment, severity or organ dysfunction, a sepsis or systemic-response prompt, neurologic observation, or arithmetic for hemodynamics and burns.
- Confirm the model’s observation window: admission values, worst values, first 24 hours, or a current structured assessment are not interchangeable.
- Treat qSOFA as a limited prompt and SIRS as a historical criteria set rather than independent sepsis diagnoses. Sedation, instability, confounders, and findings outside the model require separate clinical assessment.
Important limits
- No result independently diagnoses a disease, sepsis, shock, organ failure, or another acute condition.
- Burn and resuscitation calculators perform the stated arithmetic and do not generate a prescription, disposition, or treatment plan.
- These pages do not select testing, medication, fluids, monitoring, referral, admission, or discharge.