What P/F ratio defines ARDS severity per Berlin definition?

Mild ARDS: P/F 200-300 with PEEP/CPAP ≥5; Moderate: P/F 100-200 with PEEP ≥5; Severe: P/F <100 with PEEP ≥5; all within 1 week of known insult with bilateral opacities not explained by fluid overload or effusion.

How is ideal body weight calculated for lung-protective TV?

Males: IBW = 50 + 2.3 × (height in inches - 60); Females: IBW = 45.5 + 2.3 × (height in inches - 60); tidal volume 4-6 mL/kg IBW regardless of actual body weight; start at 6 mL/kg, titrate down to 4 mL/kg if Pplat >30.

What is the ARDSnet PEEP-FiO2 table?

Two tables: low PEEP table (PEEP 5-18, FiO2 30-100%) and high PEEP table (PEEP 5-24, FiO2 30-100%); high PEEP table used in severe ARDS; goal SpO2 88-95% or PaO2 55-80 mmHg; PEEP >24 is unusual.

What salvage therapies are used in refractory severe ARDS?

Prone positioning 16h/day reduces mortality in P/F<150 ARDS (PROSEVA trial, RR 0.61); neuromuscular blockade (48h) may improve P/F in severe ARDS; ECMO (EOLIA trial) for refractory P/F<50-80 after lung-protective ventilation.

What is driving pressure and why does it matter in ARDS?

Driving pressure = Pplat - PEEP; represents the tidal volume relative to the functional lung size; driving pressure >14-15 cmH2O is independently associated with ARDS mortality; minimizing driving pressure guides ventilator titration.

ARDS Berlin Definition Severity Classifier and Lung Protective Ventilation Calculator

Classifies ARDS severity per Berlin definition (mild/moderate/severe by P/F ratio) and calculates lung protective ventilation targets: TV 4-6 mL/kg IBW, plateau pressure ≤30 cmH2O, optimal PEEP from ARDSnet tables.

Weight

Height

Clinical Guidance

BMI is a screening measure of body size, not a direct measure of body fat. The standard WHO categories are underweight (<18.5), normal (18.5–24.9), overweight (25–29.9), and obese (≥30).

BMI can overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass. Interpret it alongside waist circumference and clinical context rather than as a standalone diagnosis.

⚕ Clinical Disclaimer: These calculators are for educational and reference purposes only. Always verify results with qualified clinical judgment and current clinical guidelines. Do not use as a sole basis for medical decisions.

How It Works

Each component has a specific meaning:

ARDSnet tables — The ardsnet tables recorded for the patient or scenario being assessed.

Note: Interpret the ards berlin classifier result against the clinical thresholds and context described above.

How to Use

Enter the ARDSnet tables for the patient or scenario you are assessing. Classifies ARDS severity per Berlin definition (mild/moderate/severe by P/F ratio) and calculates lung protective ventilation targets: TV 4-6 mL/kg IBW, plateau pressure ≤30 cmH2O, optimal PEEP from ARDSnet tables. Use the ards berlin classifier result to inform your clinical assessment.

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