Pulse Ox Pulse Oximetry Functionality

Your blood oxygen saturation doesn't just effect your athletic performance, it can influence your sleep quality too.
Pulse Ox Blood oxygen sensors are amongst the most reliable devices used for measuring blood oxygen saturation. Now Garmin has incorporated this technology into our flagship fēnix 5X Plus outdoor recreation smart watch, making it possible to measure blood oxygen saturation from your smart watch and establishing a new milestone in wearable health technology.

Conquer the mountain peak. Test your limits.

Why do you need to know your blood oxygen level?

Knowing your blood oxygen saturation (SpO2) allows you to assess your physical condition, formulate fitness goals and decide on an appropriate training intensity, all in real time. When you are engaged in outdoor activities over rapidly changing altitudes, this data can give you an idea of how your body is reacting to the changing circumstances. Combining this figure with heart rate data makes it possible to calculate a range of physiological data that can assist you to assess the effectiveness of your exercise program.* Users can also this information to develop an understanding of their sleep history by recording data on sleep time, REM sleep periods and in-sleep movement.

Blood Oxygen Saturation
24HR Records

Different Oxygen Saturation, Different Reflectivity

Our blood's hemoglobin is key to accurately detecting blood oxygen saturation. The level of oxygen contained in hemoglobin affects our bloods absorption of red and infrared light rays. By emitting light at these two frequencies, sensors on wearable devices can detect pulse data. Using this data, Garmin's specialised algorithms are able to calculate an estimate of the user's blood oxygen saturation.

Our blood's hemoglobin is key to accurately detecting blood oxygen saturation. The level of oxygen contained in hemoglobin affects our bloods absorption of red and infrared light rays.

Oxyhemoglobin
Deoxyhemoglobin
Red LED Light
Infrared Light

High oxygen saturation
Infrared light absorption > red light absorption

Low oxygen saturation
Infrared light absorption < red light absorption

Oxyhemoglobin
Deoxyhemoglobin
Red LED Light
Infrared Light
Disclaimers
* Garmin wearable devices and components are not medical products and intended to be used for leisure purposes only. They are not appropriate for use to diagnose, treat, mitigate or prevent any illness or disease. Blood oxygen saturation data is provided for reference use only and does not constitute a diagnosis, medical prescription or treatment. Before using the product, users should assess their health and seek advice from medical professionals. Garmin does not admit any legal liability for users' health condition or for health benefits derived from using the product.