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A healthy body is naturally capable of adapting to varying saturation levels.
For instance, when mountaineers go scaling peaks, their bodies get acclimatised to the low oxygen level at high altitudes.
The threshold is different for each person. Somebody with SPO2 between 88-94 may not show any breathing problems while somebody with a reading of 93 can be gasping for breath.
Low oxygen saturation in the blood without any visible manifestation of distress is called happy hypoxemia.