Pulse Oximetry Test
Pulse oximetry measures the oxygen level in your blood using a small clip-like device. It helps find out if your blood oxygen is too low, which can cause serious health problems if not treated quickly.
What this test measures
Pulse oximetry measures oxygen levels in your blood, specifically your oxygen saturation. It uses a small, clip-like device called a pulse oximeter (Pulse Ox) to check how much oxygen your red blood cells are carrying.
What your results mean
Reference ranges vary by laboratory and by your age and sex. MedlinePlus does not publish a single normal range for this test — always read your result against the range printed on your own lab report and discuss it with your provider.
Lower-than-normal results
A low oxygen level (hypoxemia) can make it hard for your body to work properly. The longer it stays low, the higher the risk of damage to your tissues and organs. According to MedlinePlus, if your oxygen saturation is 92% or lower, contact your provider. If it falls to 88% or lower, seek immediate medical attention.
Frequently asked questions
What is pulse oximetry?
Pulse oximetry is a test that uses a small, clip-like device called a pulse oximeter to measure oxygen levels in your blood.
How is the test done?
The test may be done in a health care provider's office, a clinic, a hospital, or even your home using an at-home pulse oximeter.
What is a normal oxygen saturation level?
A normal oxygen saturation level ranges between 95% and 100%.
Can my oxygen level be lower than normal and still be okay?
Yes, saturation levels may be somewhat lower and considered acceptable if you have a lung disease such as COPD or pneumonia, or if you live at a higher elevation.
When should I seek medical help for low oxygen?
Contact your provider if your oxygen saturation level is 92% or lower. If it falls to 88% or lower, seek immediate medical attention.
Related lab tests
Sources
- MedlinePlus: Pulse Oximetry — NIH MedlinePlus
Last updated . Information is aggregated from official public sources and is not a substitute for professional medical care.