ICU Severity Scores

Neurological (GCS) GCS 15 GCS 13–14 / treated delirium GCS 9–12 GCS 6–8 GCS 3–5 Respiratory PaO₂/FiO₂ > 300 ≤300 ≤225 ≤150 + ventilatory support ≤75 + ventilatory support / ECMO Cardiovascular MAP ≥70, no vasopressors MAP <70 Low-dose vasopressor (≤0.2 µg/kg/min) Moderate-dose (0.2–0.4) High-dose (>0.4) / mechanical support Hepatic (Bilirubin) ≤1.2 mg/dL ≤3.0 ≤6.0 ≤12.0 >12 Renal Creat ≤1.2 ≤2.0 or urine <0.5 ml/kg/h (6–12h) ≤3.5 or urine <0.5 ml/kg/h ≥12h >3.5 or urine <0.3 ml/kg/h ≥24h Renal replacement therapy Coagulation (Platelets) >150,000 ≤150,000 ≤100,000 ≤80,000 ≤50,000

Temperature (°C) 36–38.4 34–35.9 / 38.5–38.9 32–33.9 / 39–40.9 30–31.9 <30 / ≥41 Mean Arterial Pressure (mmHg) 70–109 50–69 / 110–129 130–159 <50 / ≥160 Heart Rate (beats/min) 70–109 55–69 / 110–139 40–54 / 140–179 <40 / ≥180 Respiratory Rate (breaths/min) 12–24 10–11 / 25–34 6–9 35–49 <6 / ≥50 Oxygenation (PaO₂ / A–a Gradient) Normal — PaO₂ ≥ 70 mmHg (FiO₂ < 0.5) Mild — PaO₂ 61–70 mmHg (FiO₂ < 0.5) Moderate — PaO₂ 55–60 mmHg (FiO₂ < 0.5) Severe — PaO₂ < 55 mmHg (FiO₂ < 0.5) Normal — A–a Gradient < 200 mmHg (FiO₂ ≥ 0.5) Moderate — A–a Gradient 200–349 mmHg (FiO₂ ≥ 0.5) Severe — A–a Gradient 350–499 mmHg (FiO₂ ≥ 0.5) Very Severe — A–a Gradient ≥ 500 mmHg (FiO₂ ≥ 0.5) Arterial pH 7.33–7.49 7.25–7.32 / 7.50–7.59 7.15–7.24 / 7.60–7.69 <7.15 / ≥7.70 Sodium (mmol/L) 130–149 150–154 120–129 / 155–159 160–179 <120 / ≥180 Potassium (mmol/L) 3.5–5.4 3.0–3.4 / 5.5–5.9 2.5–2.9 / 6.0–6.9 <2.5 / ≥7.0 Creatinine (mg/dL) <1.5 1.5–1.9 2.0–3.4 ≥3.5 Hematocrit (%) 30–45 20–29.9 / 46–49.9 50–59.9 <20 / ≥60 White Blood Cell Count (×10³/µL) 3–14.9 15–19.9 1–2.9 / ≥20 <1 Glasgow Coma Scale 15 13–14 10–12 6–9 <6

Age <44 45–54 55–64 65–74 ≥75 Chronic Health Condition No Postoperative (Elective Surgery) Non-operative or Emergency Surgery

Age <40 40–59 60–69 70–74 75–79 ≥80 Heart Rate (beats/min) 70–119 55–69 / 120–159 <55 / ≥160 Systolic Blood Pressure (mmHg) 100–199 70–99 <70 / ≥200 Temperature (°C) ≥39 38–38.9 <38 Glasgow Coma Scale 15 13–14 10–12 <10 Oxygenation (PaO₂/FiO₂) ≥200 <200 Urea (mg/dL) <10 10–29 30–59 ≥60 Sodium (mmol/L) 125–144 <125 / ≥145 Potassium (mmol/L) 3–4.9 <3 / ≥5 Serum Bicarbonate (mmol/L) ≥20 <20 Total Bilirubin (mg/dL) <4 4–5.9 ≥6 White Blood Cell Count (×10³/µL) 3–20 <3 / ≥20 Urine Output (24h) ≥1 L <1 L Type of Admission Scheduled (Elective) Emergency Recent Surgery No Yes AIDS No Yes Hematologic Malignancy No Yes