Normal Blood Oxygen Levels: What To Know - Forbes
Blood oxygen levels can be measured using several methods, some of which can be done from home. Pulse Oximetry Pulse oximetry is the most common test used to measure blood oxygen levels. The test uses a device called a pulse oximeter that clips onto a person's finger and emits light at two different wavelengths, infrared and red, which measure the oxygen saturation in the blood. The results of a pulse oximetry test provide an instant reading on the amount of oxygen in your bloodstream and other vital signs like your heart rate. However, false positives and false negatives are possible. Wearing nail polish, having a darker skin pigmentation, and moving while taking the test can all lead to less accurate results while using a pulse oximeter. Arterial Blood Gas (ABG) An arterial blood gas (ABG) test uses a blood sample from an artery or vein to measure blood oxygen levels. A venous blood gas (VBG) is a blood sample taken from a vein to measure blood oxygen levels, however th