Certified Transport Registered Nurse Certification Practice Exam

What altitude range is most likely to pose risk of hypoxic conditions?

1. Below 10,000 ft

2. 10,000 - 15,000 ft

3. 15,000 - 25,000 ft

4. Above 25,000 ft

The correct answer is: Above 25,000 ft

The altitude range above 25,000 feet poses a significant risk of hypoxic conditions due to the reduced partial pressure of oxygen, which can lead to inadequate oxygenation of bodily tissues. At this elevation, the atmospheric pressure is considerably lower, resulting in a decrease in the available oxygen for breathing. This situation can contribute to various physiological effects, including decreased cognitive function, impaired motor skills, and potential loss of consciousness if oxygen levels are not managed properly. In contrast, while lower altitudes may have some risk of hypoxia, the symptoms are much less pronounced. Below 10,000 feet, most healthy individuals can function without significant hypoxic symptoms. The range of 10,000 to 15,000 feet can begin to show effects of mild hypoxia, especially during exertion, but it is at the higher altitudes where the risk escalates dramatically, warranting supplemental oxygen for many individuals. At altitudes ranging from 15,000 to 25,000 feet, hypoxia risks continue to increase, but the threshold for critical hypoxic conditions is undeniably above 25,000 feet, where supplemental oxygen becomes essential for prolonged exposure.