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Low blood oxygen, known as hypoxemia, means that the level of oxygen in the blood has fallen below normal levels, due to one or more of many different causes. Under most circumstances, breathing room air, normal readings range from 95 to 100 percent.
When people discuss oxygen saturation levels, they are referring to the extent of haemoglobin that is saturated with oxygen. Oxygen saturation levels can be determined by medical professionals via a pulse oximetry, a non-invasive technique.The patient will have a disposable sensor placed on their forehead, earlobe, fingertip or bridge of the nose. A normal oxygen saturation level is between 95% to 100%.Oxygen levels falling below 90% are typically seen as abnormal, thereby indicating cause for concern. A drop in oxygen saturation levels is known as desaturation and there are many possible causes. Cyanosis-This is perhaps the most familiar and distinctive symptom of low oxygen saturation levels. 2  Cyanosis is a physical symptom that causes the skin or mucous membranes of the human body to turn bluish in colour. 3  This occurs because less oxygen is reaching the body tissue.