If we look at the hypoxemia meaning, in which the level of oxygen is not sufficient within the blood of the arteries. Low oxygen levels in the blood can result in the ability of the body to function properly. Like hypoxia, hypoxemia can also range from mild to life-threatening form. Symptoms and signs of hypoxemia depend upon its causes, some of the common symptoms are headache, confusion, rapid heart rate, unconsciousness, and cyanosis. Some severe cases can also lead to respiratory failure. It can also cause some additional risks because it can not be easily observed. Doctors have concluded that some patients with COVID-19 have a lower level of blood oxygen but they feel and act fine. Hypoxemia can be measured by testing the paO2 and the oxygen saturation within the arteries, which carry the oxygenated blood to the whole body.