According to research, one molecule of Hemoglobin (Hb) can combine with 4 oxygen molecules, when enough 4 oxygen molecules are attached, it is called oxygen saturation. The saturation of oxygen in the blood is also known as the SpO2 index (Saturation of peripheral oxygen), which represents the ratio of oxygenated hemoglobin to the total amount of hemoglobin in the blood. If all the hemoglobin molecules in the blood are attached to oxygen, then the oxygen saturation is 100%.
SpO2 is considered one of the vital signs of the body, besides signs such as temperature, pulse, breathing rate and blood pressure. When there is a lack of oxygen in the blood, organs such as the heart, liver, and brain will be negatively affected very quickly. Therefore, it is necessary to monitor the SpO2 index regularly to promptly intervene if a dangerous situation occurs.
A normal person’s SpO2 will be in the 95% to 100% range. A low below 94% is indicative of health problems and below 92% is a sign of severe respiratory failure, below 90% requires immediate emergency medical care and assistance.
In case you or a family member falls into a state of fatigue, shortness of breath, etc., you can check the SpO2 index to know if you are in a dangerous situation with SpO2 measuring devices.
Currently, the most common blood oxygen meters on the market are handheld devices. These are compact, easy-to-use devices at home, which help detect hypoxemia such as: Bacterial pneumonia, bronchial asthma … and pneumonia caused by Covid-19. The machine is shaped like a clamp. When measuring, users just need to open the device, put a finger in the middle, press the power button and then wait for the results to appear on the screen.
However, if you do not have a monitor available and have an Android smartphone with a built-in heart rate sensor, you can use the app Pulse Monitor to measure SpO2 index.
The heart rate sensor is a utility built into some old-generation high-end Samsung smartphones such as the Galaxy S and Galaxy Note series. In addition, a few other smartphone manufacturers also integrate this sensor. Besides the main function of measuring the user’s heart rate per minute, you can also take advantage of this sensor to measure the body’s SpO2 index.
You can find and download Pulse Monitor from the app store CH Play. After the download is complete, you access the application as usual.
Next you go to Measure in the main interface. Put your index finger and hold on to the heart rate sensor on the device and you will see a red light appear. At this point you keep your hands and body stable during the measurement. When that is done, you will see the light turn off and the blood oxygen concentration result interface will display, along with the number of heartbeats in 1 minute.
You can then press the . icon arrow to return to the main interface. If you want to measure again, press Touch to Start. The results of the measurements are saved in the parameter History.
Note that the above application is for reference only, cannot replace measuring devices and specialized medical instruments.