There are two types of tests for COVID-19. Viral (antigen) test shows if you have a current infection, and rapid antibody test shows if you've been previously infected. What's more, a new type of serological test aims to Indicate the presence of specific antibodies against virus invasion-Neutralizing antibody (NAb). The NAb test is also available now, which will guide macro epidemic prevention procedures, as well as personal health protection in the near future. Genrui, a professional rapid test manufacturer, provides rapid antigen test at home, rapid pcr test for travel, rapid diagnostic test and many other types of quick tests.

Rapid Test Types

How a Rapid COVID Test Works

Until now, the majority of COVID-19 rapid diagnostic tests have been done with a nasal or throat swab that uses the colloidal gold rapid antigen test method. 

Genrui company also offers COVID-19 rapid test that uses the Immunofluorescence method which can semi-quantitative test.

It is usually used to detect SARS-CoV-2 antigens or antibodies like (2019-nCov) lgG/LGM,  SARS-CoV-2 Spike Protein Antibodies, SARS-CoV-2 Neutralizing Antibody.

The COVID-19 rapid test is an immunotomographic flow test for testing SARS-CoV-2 antigens or antibody-like IgG/IgM in human nasal and nasopharyngeal specimens. 

At the test, SARS-CoV-2 antigens in the humen sample reacted with the anti-SARS-CoV-2 antibody packets present in the test strip by nanoparticles. The following, the mixture moved along the test strip through capillary chromatography. 

When the sample contains SARS-CoV-2 antigens, they will bind to anti-SARS-CoV-2 antibodies present in the (T) pilot area and produce color lines that indicate positive results. 

However, if there is no antigen in the sample, it will no color line occurs in the (T) pilot area. In the Control Line Area (C), a color line always appears representing the correct process and function of all components.

Bei Immunofluorescence antibody test is based on fluorescence immunoassay technology, specifically the competition immunodetection method.

When the specimen is added to the sample well of the test card, the fluorescence-labeled SARS-CoV-2 RBD protein bind to SARS-CoV-2 neutralizing antibodies in blood specimen and forming immune complexes. The excessive fluorescence-labeled SARS-CoV-2 RBD protein moves forward to the test line by capillary action and combines with the angiotensin-converting enzyme-2 (ACE2) protein which is immobilized on a test strip. Thus the more SARS-CoV-2 neutralizing antibodies in a blood specimen, the less fluorescence-labeled SARS-CoV-2 RBD protein accumulated on the test zone. 

The signal intensity of fluorescence reflects the amount of SARS-CoV-2 neutralizing antibodies captured, and Genrui FA Meters shows SARS-CoV-2 neutralizing antibodies concentrations in the blood specimen. The signal is inversely proportional to the SARS-CoV-2 neutralizing antibodies concentration.

Rapid Test FAQs

  • Q

    What is the COVID-19 Rapid test?

    A :

    COVID-19 is a disease caused by the novel coronavirus, which primarily causes respiratory diseases. When the virus enters, the antibodies will form into the body. These antibodies and antigens can be detected in human samples.  

    Using the COVID-19 Rapid Test, you can determine if your body contains COVID-19 antigen or antibodies against the novel coronavirus. The test should have sults in 15-20 minutes.

  • Q

    What if the results are positive?

    A :

    If the test is positive and you have found any possible COVID-19 symptoms.

    In this case, the Federal Department of Health recommends calling your family doctor and seeking advice. Because professional PCR testing is absolutely necessary. This also applies to other ambiguous results. 

    Also, follow health authorities' guidelines to prevent you from spreading others.

  • Q

    Rapid test and self-test: What's the difference?

    A :

    The terms rapid test and self-test by Colloidal Gold method can actually mean the same procedure. The test kit is used for site evaluation rather than examining the samples as PCR tests in the laboratory. 

    The only difference is that rapid testing can be conducted better by trained personnel. 

    Rapid test kit by Immunofluorescence method need a Genrui FA instrument can only be conducted by trained personnel.


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