TC 3-04.93 Aeromedical Training for Flight Personnel Verified Exam
Questions and Answers Latest update 2026/2027
Question:
1. Definition of Hypoxia
Answer:
Hypoxia is defined as the state of O2 deficiency in the blood cells and tissues significant enough to
cause impairment of function.
Question:
2. Types of hypoxia
Answer:
Hypoxic Hypemic Stagnant Histotoxic
Question:
3. Definition of Hypoxic Hypoxia
Answer:
Occurs when there is not enough O2 in the air or when decreasing atmospheric pressure prevents
diffusion of O2 from the lungs to the bloodstream.
Question:
4. Definition of Hypemic Hypoxia
Answer:
Hypemic, or anemic hypoxia is caused by a reduction in blood's O2-carrying capacity. Anemia and
blood loss are the most common types of this type of hypoxia.
Question:
5. Definition of Stagnant Hypoxia
Answer:
Blood's O2-carrying capacity is adequate but circulation is inadequate. Blood vessels are compressed
and not enough blood is reaching the tissues. Conditions such as heart failure, arterial spasm, and
blood Bessel occlusion predispose affected individuals to stagnant hypoxia.
Question:
6. Definition of Histotoxic Hypoxia
Answer:
Results from interference with the use of O2 by body tissues. Alcohol, narcotics, or poison such as
cyanide can poison the tissues inhibiting it from using available O2.
, Question:
7. Stages of Hypoxia
Answer:
Indifferent Compensatory Disturbance Critical
Question:
8. Describe the oxygen saturation level, altitude and symptoms as- Decreased night vision at 4,000
feet MSL
sociate with the indifferent stage.
Answer:
98%-90% oxygen saturation 0-10,000 feet
Question:
9. Describe the oxygen saturation level, altitude and symptoms as- Drowsiness, poor judgment,
impaired coordination and eflciency sociate with the compensatory stage.
Answer:
89%-80% oxygen saturation 10,000-15,000 feet
Question:
10. Describe the oxygen saturation level, altitude and symptoms as- Impaired flight control,
handwriting, speech, vision, intellectual function, sociate with the disturbance stage.
Answer:
79%-70% oxygen saturation 15,000-20,000 feet and judgement, decreased coordination, memory, and
sensation to pain
Question:
11. Describe the oxygen saturation level, altitude and symptoms as- Circulatory and central nervous
system failure, convulsions, cardiovascular sociated with the critical stage.
Answer:
69%-60% oxygen saturation 20,000 feet and above collapse, death
Question:
12. Prevention of Hypoxia
Answer:
Limit time at altitude Use supplemental oxygen Pressurize the cabin
Questions and Answers Latest update 2026/2027
Question:
1. Definition of Hypoxia
Answer:
Hypoxia is defined as the state of O2 deficiency in the blood cells and tissues significant enough to
cause impairment of function.
Question:
2. Types of hypoxia
Answer:
Hypoxic Hypemic Stagnant Histotoxic
Question:
3. Definition of Hypoxic Hypoxia
Answer:
Occurs when there is not enough O2 in the air or when decreasing atmospheric pressure prevents
diffusion of O2 from the lungs to the bloodstream.
Question:
4. Definition of Hypemic Hypoxia
Answer:
Hypemic, or anemic hypoxia is caused by a reduction in blood's O2-carrying capacity. Anemia and
blood loss are the most common types of this type of hypoxia.
Question:
5. Definition of Stagnant Hypoxia
Answer:
Blood's O2-carrying capacity is adequate but circulation is inadequate. Blood vessels are compressed
and not enough blood is reaching the tissues. Conditions such as heart failure, arterial spasm, and
blood Bessel occlusion predispose affected individuals to stagnant hypoxia.
Question:
6. Definition of Histotoxic Hypoxia
Answer:
Results from interference with the use of O2 by body tissues. Alcohol, narcotics, or poison such as
cyanide can poison the tissues inhibiting it from using available O2.
, Question:
7. Stages of Hypoxia
Answer:
Indifferent Compensatory Disturbance Critical
Question:
8. Describe the oxygen saturation level, altitude and symptoms as- Decreased night vision at 4,000
feet MSL
sociate with the indifferent stage.
Answer:
98%-90% oxygen saturation 0-10,000 feet
Question:
9. Describe the oxygen saturation level, altitude and symptoms as- Drowsiness, poor judgment,
impaired coordination and eflciency sociate with the compensatory stage.
Answer:
89%-80% oxygen saturation 10,000-15,000 feet
Question:
10. Describe the oxygen saturation level, altitude and symptoms as- Impaired flight control,
handwriting, speech, vision, intellectual function, sociate with the disturbance stage.
Answer:
79%-70% oxygen saturation 15,000-20,000 feet and judgement, decreased coordination, memory, and
sensation to pain
Question:
11. Describe the oxygen saturation level, altitude and symptoms as- Circulatory and central nervous
system failure, convulsions, cardiovascular sociated with the critical stage.
Answer:
69%-60% oxygen saturation 20,000 feet and above collapse, death
Question:
12. Prevention of Hypoxia
Answer:
Limit time at altitude Use supplemental oxygen Pressurize the cabin
