At which altitude does the air begin to be noticeably thinner?
At 12,500 feet the air becomes thinner and oxygen becomes lower making it difficult to breathe.
Last updated on 19 May 2023
Humans can survive at high altitudes. However, if you go to a high altitude, your body needs to adjust properly by getting used to it slowly or you could get sick.
High altitudes can cause low oxygen saturation levels or desaturation of an individual's blood. It happens because of low atmospheric pressure at high altitudes. Oxygen saturation levels refer to the extent hemoglobin is bound or saturated to oxygen.
High hemoglobin levels can lead to dizziness, fatigue, easy bruising and other symptoms.
High hemoglobin level is most often caused by low oxygen levels in the blood (hypoxia), present over a long period of time. Common reasons includes bone marrow disease that causes abnormal increase in red blood cells (polycythemia vera) Congenital heart disease and heavy smoking.
You will likely feel nauseous and lightheaded. You may vomit and have a headache. Different levels of altitude sickness have different symptoms: Symptoms of mild, short-term altitude sickness usually begin 12 to 24 hours after arriving at high altitude
Hb Test, Hb
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