The oximeter and ability to measure blood oxygen SpO2 is available on the COROS PACE 3, PACE Pro, APEX Pro, APEX 2, APEX 2 Pro, VERTIX, VERTIX 2, and VERTIX 2S devices.
Performing the Blood Oxygen SpO2 Measurement
Please follow the instructions below to measure your blood oxygen SpO2:
- On your compatible COROS device, press and hold the back / lap button to access the toolbox/shortcut menu.
- Scroll the dial and press the CONFIRM button to select "Oximeter"
- Press the CONFIRM button to start a new SpO2 measurement.
To ensure an accurate measurement of your blood oxygen levels, please consider the following recommendations:
- Remain seated and steady for 1-5 minutes; allowing for your body to return to a normal, relaxed state.
- Place the watch against your wrist and next to the wrist bone so that it is snug, but not uncomfortable or constricting.
- During the measurement, please keep your forearm horizontal and still.
Be aware that intense workouts can make blood oxygen greatly vary on a small scale, which may appear as erroneous data. In addition, when temperature is low, blood vessels will shrink and device may fail to detect SpO2 readings. When low temperature notification shows up during the measurement, please bring up the temperate of your wrist and resume the measurement.
Your watch is able to take an SpO2 measurement reading at any elevation, however, Altitude Performance - an indicator of your bodies response to higher altitude conditions - is only shown above 8250ft.
Interpreting the Blood Oxygen SpO2 Measurement
- Top section – Altitude Acclimation Index (available if elevation is over 2500m or 8250ft)
- Middle section – SpO2 and time since last reading
- Lower section – elevation
- Scroll down to view the SpO2 (in red, yellow and green) and elevation (in blue) graph in the last 24 hours and 3 days.
Based on the indicated zones, Altitude Acclimation Index helps climbers plan out activities accordingly.
- When Altitude Acclimation Index is between 0-60, climbers have low acclimation of current altitude. If remain in this zone for too long and have symptoms like headache, rapid heart rate, shortness of breath, chest tightness or purple discoloration on lips, it is recommended to descend. If no obvious discomfort, please focus on rest.
- When Altitude Acclimation Index is between 61-80, climbers have medium acclimation of current altitude. If no obvious discomfort, climbers can perform certain activities to better adapt to current altitude. Please focus on rest if discomfort occurs.
- When Altitude Acclimation Index is between 81-100, climbers have strong acclimation of current altitude. If remain in this zone with no obvious discomfort, expedition can resume.
Receiving Altitude Alerts on your COROS Device
Toggle on the "Altitude Alert" feature so you can be notified once you surpass 2500m or 8250ft in elevation. This will help you gauge the intensity level of your activity, so you can make the best decisions for your health and overall enjoyment of the session.
To toggle on Altitude Alerts, please follow the instructions below:
- From the main watch face, press and hold the back / lap button to access the toolbox/shortcut menu.
- Scroll the dial and select "System"
- Scroll the dial and select "More Settings"
- Scroll the dial and select "Altitude Alert"
Additional Considerations - Altitude Mode
SpO2, peripheral capillary oxygen saturation, is an estimate of the amount of oxygen in the blood and measures the amount of oxygen-carrying hemoglobin in the blood. COROS watches calculate SpO2 mainly by emitting and absolving light passing through blood vessels. As the elevation increases, SpO2 will gradually decrease.
When the elevation is above 2500 meters, oxygen intake and blood oxygen saturation will decrease and may cause symptoms including acute altitude sickness and high-altitude pulmonary edema (HAPE). COROS measures SpO2, heart rate, elevation and other data to estimate altitude acclimation at certain altitude.
COROS development team successfully applied wrist based SpO2 detection technology on watches and achieved accuracy comparable to medical fingertip measurement when remain stable at the end of 2017. However, SpO2 data provides limited assistance to climbers without applicable indications and suggestions including altitude sickness risk analysis, altitude acclimation evaluation, and activity intensity suggestions.
COROS partnered with a sport university and utilized their labs to simulate high altitude environments. After extensive data collection, research, and development for over a year, COROS was able to develop an Altitude Acclimation Evaluation System. Through applying this system, individual altitude acclimation analysis coupled with real time measurements can provide sound and practical acclimation assistance and guides for climbers. COROS Altitude Acclimation Evaluation System collects the SpO2 data and evaluates the altitude acclimation level for climbers when the elevation is above 2500 meters. Climbers are given more quantified and accurate info and under real time monitoring and notifications to effectively prevent altitude sickness.
Contact COROS Support
Need help or have additional questions? Reach out to a COROS Expert in one of the following ways:
- Submit a Support Request Form – Click here to get started
- Send a message via the COROS App:
- Open the COROS App
- Go to Profile Page > Customer Support > Contact Support > Submit.