Risk for high altitude illness

Risk of HAI	Description
Low	No prior history of altitude illness and planning ascent to <2800 m
	Taking two days or more to arrive at 2500 to 3000 m from low altitude
	Ascending no more than 500 m/day (sleeping altitude) once over 2500 m and taking one extra day to acclimatize for every additional 1000 m of ascent
Moderate	Prior history of AMS and ascending to 2500 to 2800 m in less than two days
	No history of AMS and ascending to 2800 m or higher in less than two days
	Ascending >500 m/day (increase in sleeping elevation) at altitudes above 3000 m with one extra day for acclimatization for every additional 1000 m of ascent
High	History of severe altitude illness (HACE, HAPE)
	History of AMS and ascending to 2800 m or higher in less than two days
	Ascending over 3500 m in less than two days
	Ascending >500 m/day (increase in sleeping elevation) above 3000 m without extra days for acclimatization; rapid guided ascents (eg, Mt. Kilimanjaro in <7 days)
	Persons with medical conditions predisposing to altitude illness

Notes:
Altitudes listed refer to the altitude at which the person sleeps.
Ascent is assumed to begin at low altitude (<1200m).
Risk categories are for unacclimatized persons.

AMS: acute mountain sickness; HACE: high altitude cerebral edema; HAPE: high altitude pulmonary edema; m: meters.

Adapted from: Luks AM, McIntosh SE, Grissom CK, et al. Wilderness Medical Society practice guidelines for the prevention and treatment of acute altitude illness: 2014 Update. Wilderness Environ Med 25, S4–S14 (2014).

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Risk for high altitude illness