Oxygenation & ARDS Severity Quiz
Compute the P/F ratio and classify the Berlin severity band — ten panels per round.
Panel 1 of 10
PaO₂
137 mmHg
FiO₂
0.50
Written by Apex Respiratory Editorial Team
About this quiz
Each round shows a PaO₂ and the FiO₂ it was drawn on — divide to get the P/F ratio, then read the Berlin band on PEEP/CPAP ≥ 5: above 300 is not ARDS, 201–300 mild, 101–200 moderate, and 100 or below severe. The full Berlin definition also needs bilateral opacities not fully explained by cardiac failure or fluid overload.
Educational use only. Panels are generated for exam practice and classify by the P/F ratio alone; the full Berlin definition also weighs timing, imaging, and the exclusion of cardiogenic edema. This material supports respiratory therapy education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional protocols, or physician orders. Always follow facility policies and current provider orders, and verify calculations independently before clinical use.
Sources
- ARDS Definition Task Force; Ranieri VM, Rubenfeld GD, Thompson BT, et al. Acute respiratory distress syndrome: the Berlin Definition. JAMA. 2012;307(23):2526-2533.
- Kacmarek RM, Stoller JK, Heuer AJ. Egan's Fundamentals of Respiratory Care. 12th ed. Elsevier; 2021.