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2. Hypoxemia - Wikipedia

   en.wikipedia.org/wiki/Hypoxemia

   Key to understanding whether the lung is involved in a particular case of hypoxemia is the difference between the alveolar and the arterial oxygen levels; this A-a difference is often called the A-a gradient and is normally small. The arterial oxygen partial pressure is obtained directly from an arterial blood gas determination. The oxygen ...

3. Oxygen saturation (medicine) - Wikipedia

   en.wikipedia.org/wiki/Oxygen_saturation_(medicine)

   Normal arterial blood oxygen saturation levels in humans are 96–100 percent. [1] If the level is below 90 percent, it is considered low and called hypoxemia. [2] Arterial blood oxygen levels below 80 percent may compromise organ function, such as the brain and heart, and should be promptly addressed.

4. Effects of high altitude on humans - Wikipedia

   en.wikipedia.org/wiki/Effects_of_high_altitude...

   The concentration of oxygen (O 2) in sea-level air is 20.9%, so the partial pressure of O 2 (pO 2) is 21.136 kilopascals (158.53 mmHg). In healthy individuals, this saturates hemoglobin, the oxygen-binding red pigment in red blood cells. [8]

5. The problem with pulse oximeters your doctor probably doesn’t ...

   www.aol.com/problem-pulse-oximeters-doctor...

   The gold standard and most accurate way of testing whether a person has normal oxygen levels is to stick a needle into a person’s wrist and draw blood. An arterial blood draw, as it’s called ...

6. Hypoxia (medicine) - Wikipedia

   en.wikipedia.org/wiki/Hypoxia_(medicine)

   Hypoxic breathing gases can be defined as mixtures with a lower oxygen fraction than air, though gases containing sufficient oxygen to reliably maintain consciousness at normal sea level atmospheric pressure may be described as normoxic even when the oxygen fraction is slightly below normoxic.

7. Silent hypoxia - Wikipedia

   en.wikipedia.org/wiki/Silent_hypoxia

   In COVID-19, the arterial and general tissue oxygen levels can drop without any initial warning.The chest x-ray may show diffuse pneumonia.Cases of silent hypoxia with COVID-19 have been reported for patients who did not experience shortness of breath or coughing until their oxygen levels had depressed to such a degree that they were at risk of acute respiratory distress (ARDS) and organ failure.