APACHE IV Score and ICU Mortality

Enter the admission variables and physiology values. If the patient is mechanically ventilated with FiO2 >=50%, also provide respiratory quotient and atmospheric pressure so the A-a gradient branch can be used. If GCS was not assessed, choose “Yes” for unassessed GCS. When multiple chronic health factors are selected, the calculator preserves the original APACHE IV priority order and only applies the highest-priority chronic condition branch.