ICU and Critical Care

APACHE IV Acute Physiology Score (simplified) calculator

Enter the published formula inputs below to calculate and interpret this score.

Clinical inputs

Age (years; ≥45 (+2), ≥55 (+3), ≥65 (+5), ≥75 (+6))

years

Allowed range: 18–100 years

Temp (°C; ≤29.9 (+4), ≤31.9 (+3), ≥39 (+3), ≥41 (+4))

°F

Allowed range: 77–107.6 °F

MAP (mmHg)

mmHg

Allowed range: 40–200 mmHg

Heart rate

/min

Allowed range: 30–220 /min

Respiratory rate (/min)

/min

Allowed range: 4–60 /min

Sodium (mmol/L)

mmol/L

Allowed range: 100–180 mmol/L

Creatinine (mg/dL)

mg/dL

Allowed range: 0.2–15 mg/dL

Result

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Clinical inputs

Age (years; ≥45 (+2), ≥55 (+3), ≥65 (+5), ≥75 (+6))Accepted range: 18 to 100
Temp (°C; ≤29.9 (+4), ≤31.9 (+3), ≥39 (+3), ≥41 (+4))Accepted range: 25 to 42
MAP (mmHg)Accepted range: 40 to 200
Heart rate (/min)Accepted range: 30 to 220
Respiratory rate (/min)Accepted range: 4 to 60
Sodium (mmol/L)Accepted range: 100 to 180
Creatinine (mg/dL)Accepted range: 0.2 to 15

Primary source

Zimmerman JE et al. Acute Physiology and Chronic Health Evaluation (APACHE) IV. Crit Care Med. DOI: 10.1097/01.CCM.0000181468.01723.67. PMID: 16394946. Scope: Educational simplified APACHE IV acute physiology point sum from age and key vital/lab derangements; not a full APACHE IV implementation. (2006)

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