What is oxygen saturation? What is the normal value?

Oxygen saturation (SpO2) is the percentage of the volume of oxygen-bound hemoglobin (HbO2) in the blood as a percentage of the volume of all combinable hemoglobin (Hb, hemoglobin), i.e., the concentration of oxygen in the blood, which is an important physiological parameter of the respiratory cycle.

The oxygen saturation of normal human arterial blood is 98%, and venous blood is 75%.

Expanded Information:

Measurement Methods

Many clinical diseases cause a lack of oxygen supply, which will directly affect the normal metabolism of cells, and in serious cases, can threaten a person's life, so the real-time monitoring of arterial oxygen concentration is very important in clinical rescue.

The traditional method of blood oxygen saturation measurement is to collect blood from the human body first, and then use the blood gas analyzer to conduct electrochemical analysis and measure the partial pressure of blood oxygen PO2 to calculate the blood oxygen saturation. This method is cumbersome and does not allow for continuous monitoring.

The use of finger-type photoelectric sensors, measurement, just the sensor set in the human finger, the use of the finger as a transparent container containing hemoglobin, the use of wavelength 660 nm red light and 940 nm near-infrared light as an incoming light source, the determination of the light conduction intensity through the tissue bed, to calculate the concentration of hemoglobin and oxygen saturation, the instrument can be displayed on the human body oxygen saturation, providing a continuous and non-invasive blood oxygenation, the clinic The instrument can display the blood oxygen saturation of human body, providing a continuous and non-invasive blood oxygen measurement instrument for clinical use.

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