I have been engaged in medical device related work for many years and received relevant training. I can talk about this problem here.
First of all, let's talk about the working principle of oximeter:
Measuring oxygen saturation is simply measuring the content of oxygenated hemoglobin in blood. First, we must find a way to distinguish oxygenated hemoglobin with oxygen from reduced hemoglobin without oxygen.
Based on the principle that they absorb red light and infrared light differently, the absorption of light can be converted into blood oxygen saturation by calculation.
The oximeter mainly monitors pulse rate, blood oxygen saturation and perfusion index (PI) in real time through detectors or sensors, without blood sampling. Among them, oxygen saturation is not a new function, but refers to the percentage of combined oxygen capacity in total blood volume.
Second, the factors affecting the accuracy of oximeter measurement:
There are many factors that affect the accuracy of oximeter detection, such as whether it is out of date, whether the power is sufficient, whether the finger position and temperature are appropriate, whether the finger is too thick or too thin, whether the oxygen is taken, whether the heart rate is too fast or too slow, etc. All these will affect reading. For example, some people's slow heart rate (below 60 beats/min) will lead to low oximeter reading.
I suggest you pay attention to the service life of your oximeter and replace it on time.
A simple correction method is to measure the average value several times. Before using it for patients or the elderly, you can measure it for healthy young people to see what the reading is.
Third, how to choose an oximeter:
It's actually quite simple. Go to Chinese medicine? When the Supervision and Administration Bureau inquires about the registration number of medical devices, it can be found that the category names match, which is generally no problem. If the registration number is not clearly indicated in the product details, you should keep an eye on it and see if you can find it carefully. If it is not found, the probability is false. Yes
When using finger pulse oxygen (finger clip oximeter) to monitor oxygen saturation, there are several points for attention:
It is necessary to aim the infrared ray in the finger pulse oxygen clip at the fingernail;
When monitoring pulse oxygen, keep still, including fingers, to avoid errors caused by movement;
Don't apply nail polish to the monitored fingers, otherwise it will easily interfere with the monitoring results;
Keep your fingers warm. If your fingers are cold and your peripheral circulation is poor, it will affect your grades.
When the oxygen saturation is lower than 95%, multiple fingers should be replaced and retested. If it is less than 95%, it should be sent to the hospital in time.
Smart watches:
In principle, smart watches, bracelets and professional equipment measure blood oxygen saturation by judging the ratio of absorption change rates of red light and infrared light by oxidized hemoglobin and reduced hemoglobin in human arterial blood.
There are more unstable factors in the detection of smart watches and bracelets. The monitoring part of the bracelet is the wrist, the skin is thick, and the light transmittance is worse than that of the finger. The measurement process is affected by the tightness of wearing.
At the same time, it should be noted that the home oximeter is registered with the word "medical device" and has a medical device production license, so the accuracy of monitoring data is more guaranteed. Smart bracelets belong to electronic products and do not need to undergo clinical trials. Monitoring data are for reference only and are not recommended for use as medical devices.
Therefore, if necessary, it is recommended to use a professional oximeter for monitoring, and the results of other products can be used as reference at most. At the same time, the purpose of blood oxygen measurement is to evaluate the condition, and abnormal blood oxygen is only one of the parameters. If you find any abnormality in your body, you are advised to seek medical advice in time.