Normal oxygen level in human body: Understand why oxygen levels in the blood

Understand why oxygen levels in the blood are important, what low levels mean, and when you should see a doctor for proper diagnosis and care. Blood oxygen level is the amount of oxygen present in the blood. Most of the oxygen is in red blood cells, which collect oxygen from the lungs and transport it to all parts of the body . Your body keeps a close watch on blood oxygen levels at all times to keep it within a range - that is, it should have a maximum and minimum number. This ensures that every cell gets the right amount of oxygen . Normal oxygen level is between 95 and 100 percent when measured with a pulse oximeter. Oxygen saturation is the fraction of oxygen -saturated haemoglobin relative to total haemoglobin (unsaturated + saturated) in the blood. The level of oxygen in the blood must be precisely balanced to meet the needs of the human body . Normal arterial blood oxygen saturation levels in humans are 97–100%. If the level is below 90%, it is considered low and called hypoxemia. Arterial blood oxygen levels below 80% should be promptly addressed as it might compromise organ function, such as the ... For most healthy individuals, a normal blood oxygen level (SpO2) is between 95% and 100% , regardless of age. Newborns are an exception. For the first few minutes of life, a level between 90% to 95% is considered normal, but it should quickly rise to the 95% to 100% range.