DOT Certification Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer identifies Twin Falls, which is situated at an elevation of approximately 3,745 feet above sea level, making it essential to understand the impact of altitude on oxygen levels in the blood. As elevation increases, the partial pressure of oxygen decreases, which can lead to hypoxemia, especially in individuals not acclimatized to high altitudes.

To maintain adequate oxygenation, the required minimum partial pressure of arterial oxygen (PaO2) at this elevation is greater than 65 mmHg. This threshold is critical for ensuring that individuals have enough oxygen in their system to function properly and avoid complications related to altitude sickness. Less than this level would indicate insufficient oxygenation, especially at higher elevations like that of Twin Falls.

The other options provide either incorrect elevations for Twin Falls or inappropriate PaO2 levels based on the atmospheric changes encountered at various altitudes. Recognizing the correct elevation and corresponding necessary PaO2 enables proper preparation and response for those traveling to or living in such areas.