Trek Guide
A fingertip oximeter is cheap and many trekkers carry one. What your oxygen reading can and cannot tell you at altitude, and why symptoms matter more.
By Prakash Tamang · Oct 8, 2026
A fingertip pulse oximeter costs little and weighs almost nothing, and many trekkers now carry one to Everest Base Camp. It is worth having, but only if you know what it cannot tell you. The number it shows, your blood oxygen saturation, falls as you climb…
Travel Himalaya Nepal · News
The percentage of your blood's haemoglobin carrying oxygen. At sea level it is usually in the high 90s. As you climb, the air holds less oxygen and the number falls, a lot, for healthy people too. It also moves with how you are sitting, how cold your fingers…
Travel Himalaya Nepal · News
Whether you have altitude sickness. The Wilderness Medical Society's guidelines treat acute mountain sickness as a clinical diagnosis based on symptoms, assessed with the Lake Louise score. A 2024 systematic review in Experimental Physiology found no…
Travel Himalaya Nepal · News
Useful with caveats
Fingertip pulse oximeter
Useful for spotting a trend across several mornings, and actively dangerous if you treat a single reading as a verdict — cold fingers alone can drop a reading by several points, and…
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Useful for spotting a trend across several mornings, and actively dangerous if you treat a single reading as a verdict — cold fingers alone can drop a reading by several points, and consumer devices are not calibrated for 5,000 m.
Not for: Anyone who would use it to overrule how they feel or what a guide says. Symptoms decide; the number does not.
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Same time, same way, every day, and read the trend. Take the reading at rest, sitting down, with a warm finger, at the same time each evening. A reading that keeps falling while you also feel worse is worth telling your guide about. A low number while you…
Travel Himalaya Nepal · News
What to pack for the trail. The full checklist. Batteries, screens and cold. Why a guide matters up high. The verdict: bring one, read it every evening, and believe your symptoms over the number every time. Sources: Luks et al., Wilderness Medical Society…
Travel Himalaya Nepal · News
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