How much does oxygen saturation drop during flight?

Even at 3,000 feet, there is a 10% drop in barometric pressure, and therefore a 10% drop in the number of oxygen molecules for each breath you take. Passenger airplanes are usually pressurized to between about 6,000 to 8,000 feet when the plane is cruising at 36,000 feet.



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Low air pressure during air travel also decreases the amount of oxygen in the air. This effect is modest and generally not noticeable for healthy travelers. For patients with significant lung disease, a small decrease in available oxygen can cause significant symptoms, especially with exercise.

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Resting Pulse Oximetry
Values >95% on room air suggest that inflight hypoxemia is unlikely and that further evaluation is likely not necessary. Patients with saturations <92% on room air at rest should receive supplemental oxygen inflight, because they are at high risk of hypoxemia at altitude.

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When and How Are Oxygen Masks Released? Oxygen masks release whenever there's a drop in cabin pressure. Sometimes the flight crew might initiate the release. However, it usually triggers automatically when the cabin altitude gets to 14,000 feet.

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Oxygen production cannot be shut off once a mask is pulled, and oxygen production typically lasts at least 15 minutes, sufficient for the plane to descend to a safe altitude for breathing without supplemental oxygen.

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Answer: No. The cabin is pressurized between 6,000 and 8,000 feet on long flights. Adding supplemental oxygen is not necessary, because the percentage of oxygen is the same as being on the ground at those altitudes.

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For best protection, you are encouraged to use supplemental oxygen above 10,000 feet MSL. At night, because vision is particularly sensitive to diminished oxygen, a prudent rule is to use supplemental oxygen when flying above 6,000 feet MSL. So, when you fly at high altitudes, supplemental oxygen is the only solution.

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Treatment of Hypoxia If hypoxia is suspected in yourself or others on board an aircraft, follow these simple steps: Administer supplemental oxygen (don your oxygen mask) Check your equipment for proper operation. Ensure the regulator is turned on.

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