Simplified APACHE II Score Calculator Formula
Understand the math behind the simplified apache ii score calculator. Each variable explained with a worked example.
Formulas Used
Simplified APACHE Score
simplified_score = age_points + temp_points + hr_points + gcs_pointsAge Points
age_component = age_pointsPhysiology Points
physiology_component = temp_points + hr_points + gcs_pointsVariables
| Variable | Description | Default |
|---|---|---|
age | Age(years) | 60 |
temperature_f | Temperature(F) | 101 |
heart_rate | Heart Rate(bpm) | 100 |
gcs | GCS Score(/15) | 14 |
age_points | Derived value= age >= 75 ? 6 : (age >= 65 ? 5 : (age >= 55 ? 3 : (age >= 45 ? 2 : 0))) | calculated |
temp_c | Derived value= (temperature_f - 32) * 5 / 9 | calculated |
temp_points | Derived value= abs(temp_c - 37) >= 4 ? 4 : (abs(temp_c - 37) >= 3 ? 3 : (abs(temp_c - 37) >= 2 ? 2 : (abs(temp_c - 37) >= 1 ? 1 : 0))) | calculated |
hr_points | Derived value= abs(heart_rate - 80) >= 70 ? 4 : (abs(heart_rate - 80) >= 45 ? 3 : (abs(heart_rate - 80) >= 30 ? 2 : 0)) | calculated |
gcs_points | Derived value= 15 - gcs | calculated |
How It Works
Simplified APACHE II Score
The full APACHE II uses 12 physiologic variables, age, and chronic health status. This simplified version uses the most accessible variables.
Age Points
| Age | Points | |---|---| | <45 | 0 | | 45-54 | 2 | | 55-64 | 3 | | 65-74 | 5 | | 75+ | 6 |
Score Interpretation
Higher scores indicate greater severity. The full APACHE II (0-71) correlates with ICU mortality risk. This simplified version provides a directional estimate.
Worked Example
A 60-year-old ICU patient: temp 101F, HR 100, GCS 14.
age = 60temperature_f = 101heart_rate = 100gcs = 14
- 01Age points = 3 (55-64)
- 02Temp = 38.3C, deviation = 1.3, points = 1
- 03HR deviation from 80 = 20, points = 0
- 04GCS points = 15 - 14 = 1
- 05Total = 3 + 1 + 0 + 1 = 5
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Open Simplified APACHE II Score Calculator