Pulmonary & Critical Care Calculators
17 calculators.
Alveolar–Arterial (A–a) O₂ GradientA–a gradient = PAO₂ − PaO₂, where PAO₂ = FiO₂ × (Patm − 47) − PaCO₂/0.8. On room air the…APACHE II ScoreAPACHE II grades ICU illness severity (0–71) from the worst values in the first 24 hours…ARDSNet Tidal Volume (Predicted Body Weight)Lung-protective ventilation targets a tidal volume of 6 mL/kg predicted body weight…BODE Index for COPD SurvivalThe BODE index (0–10) predicts mortality in COPD from Body-mass index, airflow…CRB-65 Score for Pneumonia (no labs)CRB-65 is CURB-65 without urea, for use where blood tests are unavailable: Confusion,…CURB-65 Score for Pneumonia SeverityCURB-65 scores community-acquired pneumonia severity from Confusion, Urea >7 mmol/L (BUN…Glasgow Coma Scale (GCS)The Glasgow Coma Scale sums eye opening (1–4), verbal response (1–5) and motor response…Light's Criteria for Pleural EffusionLight's criteria classify a pleural effusion as an exudate if ANY of: pleural/serum…NEWS2 (National Early Warning Score 2)NEWS2 (Royal College of Physicians, 2017) aggregates respiratory rate, SpO₂ (Scale 1, or…Oxygenation Index (OI)Oxygenation index = (mean airway pressure × FiO₂ % ) ÷ PaO₂. In ventilated children…PaO₂/FiO₂ (P/F) Ratio with Berlin ARDS SeverityThe PaO₂/FiO₂ ratio quantifies hypoxemia. Under the Berlin definition (with PEEP or CPAP…Pneumonia Severity Index (PSI / PORT Score)The Pneumonia Severity Index (Fine 1997) assigns community-acquired pneumonia patients…qSOFA (Quick SOFA) Score for SepsisqSOFA flags adults with suspected infection at higher risk of death or prolonged ICU…ROX Index for High-Flow Nasal CannulaThe ROX index = (SpO₂ / FiO₂) / respiratory rate predicts high-flow nasal cannula (HFNC)…SIRS Criteria (Systemic Inflammatory Response Syndrome)SIRS is present when ≥2 of 4 criteria are met: temperature >38 °C or <36 °C, heart rate…SOFA Score (Sequential Organ Failure Assessment)SOFA scores dysfunction of six organ systems (respiratory, coagulation, liver,…STOP-Bang Questionnaire for Obstructive Sleep ApneaSTOP-Bang screens for obstructive sleep apnea with 8 yes/no items: Snoring, Tiredness,…