Critical Care
ICU scoring systems, ventilator management, and severity of illness scales.
Critical CareNew
APACHE II Score
Disease severity and mortality prediction in ICU.
5 minCalculate →
Critical CareNew
Ventilator FiO₂ Calculator
Calculate required FiO2 for target PaO2.
1 minCalculate →
Critical Care
P/F Ratio
Assessment of ARDS severity.
1 minCalculate →
Critical Care
A-a Gradient
Alveolar-arterial oxygen gradient.
2 minCalculate →
Clinical Overview
Critical care requires continuous assessment of organ dysfunction and mortality risk. These tools support ICU admission decisions, prognostic discussions, and ventilator optimization.
Common Use Cases
- •ICU mortality prediction
- •Ventilator setting adjustments
- •Organ failure assessment
- •Oxygenation tracking
Clinical Pearls
APACHE II Timing
The APACHE II score should be calculated using the worst values recorded during the first 24 hours of ICU admission.
ARDS Definition
The Berlin Definition classifies ARDS based on P/F ratio: Mild (200-300), Moderate (100-200), and Severe (<100) when PEEP is ≥5 cm H₂O.