Free Oxygenation Practice Tool
OxyGenius
Practice PaO₂ classification, P/F ratio severity, and Berlin ARDS criteria with a fast clinical reasoning simulator.
Clinical scenario
Massive Aspiration
58-year-old male aspirated gastric contents during emergency intubation.
Arterial Oxygen Tension
PaO₂ mmHg
Oxygenation Practice, P/F Ratio Quiz & ARDS Criteria Training
OxyGenius is a free oxygenation practice tool for learning PaO₂ interpretation, hypoxemia severity, P/F ratio calculation, ARDS severity classification, and Berlin ARDS criteria.
Classify PaO₂
Practice normal oxygenation, mild hypoxemia, moderate hypoxemia, severe hypoxemia, and hyperoxemia.
Calculate P/F ratio
Use FiO₂ and PaO₂ to estimate oxygenation severity and recognize ARDS categories.
Apply ARDS criteria
Learn why P/F ratio alone is not enough without timing, bilateral opacities, and non-cardiogenic respiratory failure.
Quick reference
PaO₂ oxygenation: 80–100 normal · 60–79 mild hypoxemia · 40–59 moderate hypoxemia · <40 severe hypoxemia · >100 hyperoxemia.
P/F ratio: PaO₂ divided by FiO₂ as a decimal. Normal is usually >300. ARDS categories are mild 201–300, moderate 101–200, and severe ≤100.
ARDS criteria: acute timing, bilateral opacities, impaired oxygenation, and respiratory failure not fully explained by cardiac failure or fluid overload.
New to oxygenation assessment? Start with the P/F Ratio Guide or review oxygenation physiology with the A–a Gradient Calculator.
Continue Building Oxygenation Reasoning
Pair OxyGenius with PulmTools guides and calculators for ABG interpretation, hypoxemia workups, and ARDS review.
OxyGenius: Oxygenation Practice Cases
OxyGenius is a free oxygenation practice simulator for respiratory therapy students, nursing students, ICU clinicians, medical trainees, and anyone learning hypoxemia interpretation. It combines PaO₂ classification, P/F ratio practice, ARDS severity categories, and Berlin ARDS criteria into one fast clinical reasoning workflow.
PaO₂ interpretation
Practice classifying normal oxygenation, mild hypoxemia, moderate hypoxemia, severe hypoxemia, and hyperoxemia.
P/F ratio practice
Calculate PaO₂ divided by FiO₂ and identify normal, mild ARDS, moderate ARDS, and severe ARDS categories.
ARDS criteria training
Learn why a low P/F ratio alone does not diagnose ARDS without timing, bilateral opacities, and non-cardiogenic respiratory failure.