Q1: When is the antigen test required?
Suspected symptoms of the new crown, such as: fever, dry throat, sore throat, etc .; contact with positive patients or have been to high-risk areas; when there is any concern or willingness to test, it can be measured.
focus
The antigen will not be positive immediately after infection or high-risk exposure, so if a negative result is detected, you can wait 1-2 days before continuing the test for further confirmation.
Q2: How to choose the antigen?
The principles of antigen detection test strips on the market are basically the same, as long as they are qualified products that meet national standards, they should all have the same effect .
If you are not sure about the product quality, you can check the medical device registration certificate number on the package . In addition, pay attention to the expiry date of the test strips .
The medical device registration certificate number on the packaging of the new crown antigen｜Gao Qiqi
Q3: What should I prepare before the test?
1. In order to avoid contamination of the sample, it is best to wash your hands first and avoid touching the front end of the sampling swab.
2. Blow your nose before taking a nasal swab; do not eat or drink for 10 minutes before taking a saliva test.
Q4: What should be paid attention to when testing?
focus
Be sure to read and follow the instructions carefully,
Ensure sufficient sampling time and correct sampling position.
For example, when the instructions stipulate that when sampling from the nasal cavity, do not change it to sampling from the oral cavity.
Nasal sampling may feel sore and swollen, but it is basically painless.
And it should be inserted into the nasal cavity to a sufficient depth (1-1.5 cm) and sampled for a sufficient time (15 seconds) according to the instructions.
Location and method of nasal swab sampling丨Heijio sister
Note : It is easy to sneeze when collecting nasal swabs. You can cover your mouth with a mask to reduce droplet spray.
Q5: What should be paid attention to in the reading?
1. Read the result 15-30 minutes after adding the sample according to the instruction manual. Insufficient time may lead to inaccurate reading of the result.
2. Whether it is two clear and dark bars, or only a light line at the T, it should be regarded as a positive result.
3. If there is no line at C, it means that there is something wrong with the test paper and needs to be tested again.
Screenshot of the new crown antigen e-commerce details page
Q6: If it is negative, can I feel at ease?
If you test positive, you must be recruited?
uncertain.
As a screening method, antigen detection has the advantages of convenience and speed. You can get a preliminary result through simple operations at home. Compared with nucleic acid testing that takes longer and requires professional equipment and testing personnel, the convenience of antigen testing is self-evident.
However, such convenience also makes the accuracy of antigen detection slightly lower than that of nucleic acid detection, and there may be “false positives” and “false negatives” , which are difficult to completely avoid.
Antigen detection requires a high viral load to be positive. When the symptoms of the new crown infection just appear or in the late stage of infection, the amount of virus in the infected person’s body may not be enough to detect the antigen positive. Nucleic acid testing is the “gold standard” for diagnosing COVID-19 infection, which is currently considered the most accurate testing method in medicine , and it can be detected even if the amount of virus in the infected person’s body is very low.
Therefore, it is recommended in medicine that antigen detection is only used as a preliminary screening method for people in need, not a diagnostic method.
husk advice
If symptoms have already appeared and the antigen test is negative, it is best to continue to measure and confirm the next day, or perform a nucleic acid test if necessary; similarly, if the antigen test is positive, take precautions and contact the local epidemic prevention department in time Personnel, final confirmation upon request.
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Author: Window Knocking on the Rain, Li Xiaoqiu
Editor: Gao Qiqi
references
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