Description

• The device shines beams of red and infrared light through the finger, including the skin, nail, tissue, and blood.
• A sensor on the other side of the clip detects and measures how much of that light passes through without being absorbed by the tissue and blood.
• The amount of light absorbed is influenced by the oxygen content in the blood’s hemoglobin.
• Oxygenated hemoglobin absorbs more infrared light, while deoxygenated hemoglobin absorbs more red light.
• By analyzing the ratio of red light to infrared light absorption, the pulse oximeter calculates the percentage of hemoglobin carrying oxygen, which is your SpO2, and your pulse rate. 

• SpO2 (Oxygen Saturation): This number indicates the percentage of your blood that is carrying oxygen. For most healthy individuals, a normal SpO2 reading typically ranges from 95% to 100%. However, individuals with certain lung conditions may have lower normal ranges.

• Accuracy: While pulse oximeters are valuable tools, they are not always perfectly accurate. The U.S. Food and Drug Administration (.gov) warns about the limitations and accuracy of pulse oximeters.
  • Factors like poor circulation, skin thickness, skin pigmentation, skin temperature, tobacco use, and fingernail polish can affect readings.
  • Studies suggest that pulse oximeters may be less accurate for individuals with darker skin tones.
  • Accuracy tends to decrease at lower oxygen saturation levels.
• Consult your healthcare provider: If you’re considering using a pulse oximeter at home, discuss it with your doctor. They can provide guidance on appropriate SpO2 levels for your specific condition and help you interpret readings.
• Not a substitute for medical advice: Pulse oximeter readings should be used in conjunction with other symptoms and information provided by your doctor to make informed decisions about your health.