How does APACHE IV improve on APACHE II?

APACHE IV uses 142 variables including diagnosis-specific acute physiology weights, ICU admission location, and worst values in first 24 hours. It provides AUROC 0.88 vs 0.85 for APACHE II for hospital mortality prediction and also estimates ICU LOS and ventilator days, enabling benchmarking against peer ICUs.

What APACHE IV data is required?

APACHE IV requires: demographic data (age, weight, height), source of ICU admission, elective surgery status, chronic health conditions, primary ICU diagnosis from structured list, and 142 physiologic variables (worst values first 24h including temperature, HR, SBP, MAP, RR, PaO2, FiO2, SpO2, GCS, urine output, labs).

APACHE IV ICU Mortality Prediction Calculator

Calculate APACHE IV mortality prediction using 142 variables across physiology, diagnosis, chronic conditions, and ICU admission source for superior discrimination over APACHE II.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How It Works

Calculate APACHE IV mortality prediction using 142 variables across physiology, diagnosis, chronic conditions, and ICU admission source for superior discrimination over APACHE II

Each component has a specific meaning:

Diagnosis — The diagnosis recorded for the scenario being assessed.
Chronic conditions — The chronic conditions recorded for the scenario being assessed.
ICU admission source — The icu admission source recorded for the scenario being assessed.

Note: Interpret the apache iv result against the thresholds and context described above.

How to Use

Enter the diagnosis, chronic conditions, ICU admission source for the scenario you are assessing. Calculate APACHE IV mortality prediction using 142 variables across physiology, diagnosis, chronic conditions, and ICU admission source for superior discrimination over APACHE II. Use the apache iv result to inform your calculation.

Related Calculators

APACHE II Score

Medical Long-tail

SAPS III Score