Certified Transport Registered Nurse Certification Practice Exam

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Prepare for the Certified Transport Registered Nurse Test. Use flashcards and multiple choice questions with hints and explanations. Equip yourself for success in your certification exam!

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What is the normal P/F ratio for healthy individuals?

200-300
100-200
500
300-400

The correct answer is: 500

The normal P/F ratio, which stands for the PaO2/FiO2 ratio, is a critical measure used in assessing the degree of hypoxemia in patients. In healthy individuals, the P/F ratio typically reflects a normal lung function, indicating that the lungs are able to effectively facilitate the exchange of oxygen and carbon dioxide. A P/F ratio of around 500 is considered to be the upper limit of normal for healthy individuals. This value is derived from the understanding that in a typical state, with adequate oxygenation and no significant underlying pulmonary disease, arterial oxygen tension (PaO2) when breathing room air (FiO2 about 21%) should be high enough to maintain this ratio. The other ranges provided do not represent normal values for healthy individuals. For instance, a P/F ratio of 200-300 is often indicative of mild acute respiratory distress syndrome (ARDS), while a ratio of 100-200 suggests moderate ARDS. A P/F ratio of 300-400 is generally classified under mild hypoxemia but still does not align with the ideal range found in healthy patients. Thus, the value of 500 accurately characterizes the normal physiological state of arterial oxygenation in healthy lungs.