What is pulse oximetry? Pulse oximetry is a test used to measure the oxygen level (oxygen saturation) of the blood. It is an easy, painless measure of how well oxygen is being sent to parts of your body furthest from your heart, such as the arms and legs. A clip-like device called a probe is placed on a body part, such as a finger or ear lobe. The probe uses light to measure how much oxygen is in the blood. This information helps the healthcare provider decide if a person needs extra oxygen. Why might I need pulse oximetry? Pulse oximetry may be used to see if there is enough oxygen in the blood. This information is needed in many kinds of situations. It may be used: During or after surgery or procedures that use sedation To see how well lung medicines are working To check a person's ability to handle increased activity levels To see if a ventilator is needed to help with breathing, or to see how well it's working To check a person has moments when breathing stops during sleep (sleep apnea) Pulse oximetry is also used to check the health of a person with any condition that affects blood oxygen levels, such as: Heart attack Heart failure Chronic obstructive pulmonary disease (COPD) Anemia Lung cancer Asthma Pneumonia Your healthcare provider may have other reasons to advise pulse oximetry.
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