Description
Pulse Oximetry: Purpose, Uses, and How to Take a Reading
A pulse oximeter measures your blood oxygen levels and pulse. A low level of oxygen saturation may occur if you have certain health conditions. Your skin tone may also affect your reading.
Pulse oximetry is a noninvasive test that measures the oxygen saturation level of your blood.
It can rapidly detect even small changes in oxygen levels. These levels show how efficiently the blood is carrying oxygen to the extremities furthest from your heart, including your arms and legs.
The pulse oximeter is a small, clip-like device. It attaches to a body part, most commonly a finger.
Medical professionals often use them in critical care settings like emergency rooms or hospitals. Some doctors, such as pulmonologists, may use them in office settings. You can even use one at home.
The purpose of pulse oximetry is to see if your blood is well oxygenated.
Medical professionals may use pulse oximeters to monitor the health of people with conditions that affect blood oxygen levels, especially while they’re in the hospital.
These can include:
- chronic obstructive pulmonary disease (COPD)
- asthma
- pneumonia
- lung cancer
- anemia
- heart attack or heart failure
- congenital heart disease
Doctors use pulse oximetry for a number of different reasons, including:
- to assess how well a new lung medication is working
- to evaluate whether someone needs help breathing
- to evaluate how helpful a ventilator is
- to monitor oxygen levels during or after surgical procedures that require sedation
- to determine whether someone needs supplemental oxygen therapy
- to determine how effective supplemental oxygen therapy is, especially when treatment is new
- to assess someone’s ability to tolerate increased physical activity
- to evaluate whether someone momentarily stops breathing while sleeping — like in cases of sleep apnea — during a sleep study
Pulse oximetry may be useful in both inpatient and outpatient settings. In some cases, your doctor may recommend that you have a pulse oximeter for home use.
To take a reading with a pulse oximeter, you will:
- Remove any jewelry or fingernail polish on your finger if measuring from this location.
- Make sure your hand is warm, relaxed, and below heart level if attaching the device here.
- Place the device on your finger, earlobe, or toe.
- Keep the device on for as long as needed to monitor your pulse and oxygen saturation.
- Remove the device once the test is over.
In pulse oximetry, small beams of light pass through the blood in your finger, measuring the amount of oxygen. According to the British Lung Foundation, pulse oximeters do this by measuring changes in light absorption in oxygenated or deoxygenated blood. This is a painless process.
The pulse oximeter will be able to tell you your oxygen saturation levels along with your heart rate.
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