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What is Oxygen Saturation (SpO2)?

Oxygen Saturation (SpO2) is a wellness metric that measures the percentage of oxygen your red blood cells are carrying. Monitoring this value helps you understand how efficiently your body is transporting oxygen, which is a key indicator of your overall respiratory and cardiovascular health.

What Oxygen Saturation Is

Oxygen Saturation, often referred to as SpO2, represents the level of oxygenated hemoglobin in your blood. Hemoglobin is a protein in your red blood cells responsible for carrying oxygen from your lungs to the rest of your body. The SpO2 value is expressed as a percentage. For example, a reading of 97% means that 97% of the hemoglobin in your blood is carrying oxygen.

  • Measurement: Your compatible smartwatch measures SpO2 non-invasively using red and infrared light sensors on your wrist.
  • Normal Range: A typical SpO2 level for most healthy individuals is between 95% and 100%.
  • Context: Readings are usually taken during periods of stillness, such as sleep, to ensure accuracy and provide a consistent baseline.

Why It Matters

Tracking your Oxygen Saturation provides valuable insight into your body's performance and resilience. Consistently healthy SpO2 levels indicate that your lungs, heart, and circulatory system are effectively supplying your body with the oxygen it needs to function. Monitoring trends can help you identify how certain factors—such as changes in altitude, intense physical training, or potential illness—may be impacting your body's oxygen efficiency.

Summary

This article explains Oxygen Saturation (SpO2), a key wellness metric that measures the oxygen levels in your blood. By tracking SpO2, you can gain a better understanding of your respiratory health and how well your body distributes oxygen, which is essential for overall fitness and well-being.

Related

  • View Your Wellness Metrics (Sleep, Steps, Vitals)
  • What is Respiratory Rate?
  • Analyze your body metric trends over time
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