Pulse Oximetry
Pulse oximetry is used to check your blood oxygen level.
Pulse oximetry is used to check your blood oxygen level. The test may be done in your health care provider's office, a clinic, a hospital, or even your home. An at-home pulse oximeter may be helpful if you have a serious and/or chronic lung disease .
Why is this test ordered? Your provider may give you a pulse-oximetry test as part of a routine checkup. You may also get the test if you: Have a condition that affects your lung function. These can include chronic obstructive pulmonary disease ( COPD ), lung cancer , heart failure , asthma , and COVID-19 . Are taking medicine to treat lung disease. The test can show how well the medicine is working. Are having surgery . Your blood oxygen level may be checked before, during, and after your procedure. Have sleep apnea . This is a disorder that causes you to repeatedly stop breathing during sleep. Use extra oxygen ( oxygen therapy ). This may help your provider determine if you are getting the right oxygen flow rate from your oxygen device. Have shortness of breath (feeling like you can't get enough air).
Clinical Interpretation
Results are often given as oxygen saturation levels. A normal oxygen saturation level ranges between 95% and 100%. Saturation levels may be somewhat lower and considered acceptable if you have a lung disease such as COPD or pneumonia . Your levels may also be lower if you live in an area with a higher elevation, where there is less oxygen in the air. If you are using an at-home oximeter, watch for signs or symptoms that you have low oxygen levels, such as: Lips, nails, or face that look bluish (cyanosis) Trouble breathing or shortness of breath Chest pain or tightness Fast heart rate Contact your provider if your oxygen saturation level is 92% or lower. If it falls to 88% or lower, seek immediate medical attention. If you have questions about your results, talk to your provider.
Clinical Protocol & Patient Advice
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Dark nail polish on the finger being tested can block the light emitted from the oximeter. Other things that may cause inaccurate results can include: Artificial nails A darker skin pigmentation (color) Poor circulation Cold skin Tobacco use
Usage Guidance
- Reference ranges vary by laboratory. Always discuss your specific results with a qualified healthcare professional.
Source: MedlinePlus, National Library of Medicine. View the original.