APACHE II combines 12 physiological variables (worst value in the first 24h of ICU admission) + age points + chronic health points. If FiO2 ≥ 0.5, PaCO2 is required (A-a gradient); submit arterial pH or serum bicarbonate (at least one).
Medical notice: Reference and organization tool for healthcare professionals. This is NOT a medical device, does NOT provide a diagnosis, and does NOT replace clinical judgment or current institutional guidelines. The professional using this calculator is responsible for validating every result against current evidence and regulations before applying it to a real patient. Free tool by CESCAC Productos y Servicios S.A.S. (RUC 0993389404001, Ecuador).
Technical note: The predicted mortality shown here is a ROUGH approximation (only the base term of the Knaus 1985 equation), without the diagnostic-category-specific weight. Do not use as the sole basis for clinical decisions.
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