DOT Certification Practice Exam

What is the minimum required PaO2 at an altitude above 5000 ft?

1. 50 mmHg

2. 55 mmHg

3. 60 mmHg

4. 65 mmHg

The correct answer is: 60 mmHg

At altitudes above 5,000 feet, the minimum required arterial oxygen partial pressure (PaO2) is important for maintaining adequate oxygenation and preventing hypoxemic conditions. The correct value of 60 mmHg serves as a guideline for ensuring that individuals, especially those engaged in physical activities such as flying or mountain climbing, have sufficient oxygen for their physiological needs. As altitude increases, atmospheric pressure decreases, which in turn reduces the available oxygen. The standard for safe oxygen levels helps to assess whether individuals are at risk for altitude-related illnesses. A PaO2 of 60 mmHg is recognized within medical guidelines as a threshold for adequate oxygenation, suggesting that individuals should aim to maintain their levels above this value to function effectively and avoid complications. Choosing 60 mmHg as the minimum required PaO2 above 5,000 feet reflects considerations based on research and clinical practices that prioritize preventative health measures in hypoxic environments.