The oxygen level in the blood is an important medical tool used to determine how effectively take oxygen to your body. If you have good health, normal blood oxygen levels usually fall within a predictable range. Medical professionals use two main steps to determine your level of oxygen in blood oxygen saturation and arterial oxygen. Normal values differ for these measures.
Blood oxygen saturation
When inhaling, the oxygen enters your lungs and binds to a carrier protein called hemoglobin in your blood cells. Those same red blood cells release carbon dioxide to your lungs, leaving your body when you breathe out. Red blood cells carry oxygen to recently oxygenates your body.
A pulse oximeter uses light to measure the oxygen saturation level, the percentage of hemoglobin in your blood cells that carry oxygen. Normal levels of oxygen saturation falling between 95 and 99 percent.
Oxygen in arterial blood
While a pulse oximeter is the most common device used to determine your blood oxygen level, sometimes it is necessary to analyze blood taken directly from an artery to evaluate your oxygen level. This measure is called arterial oxygen. A normal level of oxygen in arterial blood usually falls between 75 to 100 mmHg. Your level of carbon dioxide in blood and pH (a measure of acidity or alkalinity) is typically measured along with the level of oxygen in arterial blood.