APACHE II Score Calculator Sponsored Advertising placement APACHE II Score Clinical Decision Tool Calculates APACHE II illness-severity points from acute physiology, age and chronic health status. Rectal Temperature (°C) ≥41 (+4) +4 39–40.9 (+3) +3 38.5–38.9 (+1) +1 36–38.4 (+0) 0 34–35.9 (+1) +1 32–33.9 (+2) +2 30–31.9 (+3) +3 <29.9 (+4) +4 Mean Arterial Pressure (mmHg) ≥160 (+4) +4 130–159 (+3) +3 110–129 (+2) +2 70–109 (+0) 0 50–69 (+2) +2 <50 (+4) +4 Heart Rate (beats/min) ≥180 (+4) +4 140–179 (+3) +3 130–139 (+2) +2 70–129 (+0) 0 55–69 (+2) +2 40–54 (+3) +3 <40 (+4) +4 Respiratory Rate (breaths/min) ≥50 (+4) +4 35–49 (+3) +3 25–34 (+1) +1 12–24 (+0) 0 10–11 (+1) +1 6–9 (+2) +2 <6 (+4) +4 Oxygenation points Normal / no points (+0) 0 Mild abnormality / 1 point (+1) +1 Moderate abnormality / 3 points (+3) +3 Severe abnormality / 4 points (+4) +4 Arterial pH ≥7.70 (+4) +4 7.60–7.69 (+3) +3 7.50–7.59 (+1) +1 7.33–7.49 (+0) 0 7.25–7.32 (+2) +2 7.15–7.24 (+3) +3 <7.15 (+4) +4 Serum Sodium (mmol/L) ≥180 (+4) +4 160–179 (+3) +3 155–159 (+1) +1 130–154 (+0) 0 120–129 (+2) +2 111–119 (+3) +3 ≤110 (+4) +4 Serum Potassium (mmol/L) ≥7.0 (+4) +4 6.0–6.9 (+3) +3 5.5–5.9 (+1) +1 3.5–5.4 (+0) 0 3.0–3.4 (+1) +1 2.5–2.9 (+2) +2 <2.5 (+4) +4 Serum Creatinine points ≥3.5 mg/dL (≥309 µmol/L) (+4) +4 2.0–3.4 mg/dL (177–308 µmol/L) (+3) +3 1.5–1.9 mg/dL (133–176 µmol/L) (+2) +2 0.6–1.4 mg/dL (53–132 µmol/L) (+0) 0 <0.6 mg/dL (<53 µmol/L) (+2) +2 Acute renal failure (double creatinine points) No 0 Yes +1 Haematocrit (%) ≥60 (+4) +4 50–59.9 (+2) +2 46–49.9 (+1) +1 30–45.9 (+0) 0 20–29.9 (+2) +2 <20 (+4) +4 White Blood Cell Count (×10⁹/L) ≥40 (+4) +4 15–39.9 (+1) +1 3–14.9 (+0) 0 1–2.9 (+2) +2 <1 (+4) +4 Glasgow Coma Scale 3–15 Age ≤44 years (+0) 0 45–54 years (+2) +2 55–64 years (+3) +3 65–74 years (+5) +5 ≥75 years (+6) +6 Chronic health points None (+0) 0 Elective postoperative with severe organ insufficiency or immunocompromise (+2) +2 Nonoperative or emergency postoperative with severe organ insufficiency or immunocompromise (+5) +5 Calculate APACHE II Score Clear Calculator ☆ Log in to save Save this calculator to your MDPDA account. + Add to Toolkit Log in to save incomplete calculator progress and return later. Log in to save progress Clinical Decision Support Only MediCalc calculators are intended to support qualified healthcare professionals and must not replace professional clinical judgement. Do not enter patient-identifiable information into Saved Progress. Read our Clinical Disclaimer Sponsored Advertising placement
