APACHE II
Calculator
When to use
Age (years)
< 45
45-54
55-64
65-74
≥ 75
Rectal temperature (°C [°F])
< 30 [< 86]
30-31.9 [86-89.5]
32-33.9 [89.6-93.1]
34-35.9 [93.2-96.7]
36-38.4 [96.8-101.2]
38.5-38.9 [101.3-102.1]
39-40.9 [102.2-105.7]
≥ 41 [≥ 105.8]
Mean arterial pressure (mmHg)
≥ 160
130-159
110-129
70-109
50-69
< 50
Arterial pH
≥ 7.7
7.6-7.69
7.5-7.59
7.33-7.49
7.25-7.32
7.15-7.24
< 7.15
Heart rate (bpm)
≥ 180
140-179
110-139
70-109
55-69
40-54
< 40
Respiratory rate (rpm)
≥ 50
35-49
25-34
12-24
10-11
6-9
< 6
Serum sodium (mEq/L)
≥ 180
160-179
155-159
150-154
130-149
120-129
111-119
< 111
Serum potassium (mEq/L)
≥ 7.0
6.0-6.9
5.5-5.9
3.5-5.4
3.0-3.4
2.5-2.9
< 2.5
Serum creatinine (mg/dL)
≥ 3.5
2.0-3.4
1.5-1.9
0.6-1.4
< 0.6
Acute renal failure
No
Yes
Hematocrit (%)
≥ 60
50-59.9
46-49.9
30-45.9
20-29.9
< 20
White blood cell count (×10**3/mcL)
≥ 40
20-39.9
15-19.9
3-14.9
1-2.9
< 1
Glasgow Coma Scale (GCS)
Oxygenation (use PaO₂ if FiO₂ < 50% or non-intubated, otherwise use A-a gradient; mmHg)
PaO₂ > 70
PaO₂ 61-70
PaO₂ 55-60
PaO₂ < 55
A-a < 200
A-a 200-349
A-a 350-499
A-a ≥ 500
Setting
Nonoperative
Emergency surgery
Elective surgery
Severe organ failure (liver cirrhosis, congestive heart failure, chronic lung disease, chronic kidney disease on dialysis) or immunocompromise
No
Yes
Calculation
Please enter all the required inputs.