New Product: COVID-19 Antigen Test Kit

The new coronavirus antigen test kit is a lateral flow immunoassay for the qualitative detection of SARS-COV-2 antigen (nucleocapsid protein) in upper respiratory samples with nasal swabs during the acute phase of infection. 

  • 15-minute rapid detection
  • Easy-to-operate coronavirus antigen test
  • Less-invasive nasal (NS) swab sample collection
  • CE-IVD marked

COVID-19 Antigen Rapid Test Principle

The coronavirus antigen rapid test kit is a lateral flow assay that qualitatively detects the presence of nucleocapsid (N) protein in upper respiratory samples (nasal swabs). This lateral flow assay is designed with the sandwich immunoassay format. When the specimen is added onto the sample pad of a test cassette, coronavirus N protein binds with colloidal gold-labeled SARS-CoV-2 N protein antibody to form an antibody-antigen (Ab-Ag) complex. The Ab-Ag complex is captured by SARS-CoV-2 N protein antibody (Rabbit monoclonal antibody) when migrating to the test line under capillary action. A red-colored band will appear on the test line, which indicates the specimen is COVID-19 nucleocapsid protein positive. No color band will appear on the test line if the specimen does not contain any coronavirus antigen (N protein), or the antigen level is below detection limit.

Coronavirus Antigen (Ag) Rapid Test Kit Principle

Coronavirus Antigen (Ag) Rapid Test Kit Principle


The conjugation pad also contains colloidal gold-labeled chicken IgY, which is captured by Goat anti-chicken IgY on the control line as procedural control. A colored band on the control line represents the proper liquid flow through the cassette; the absence of a colored band on the control line indicates insufficient sample or buffer volume.

COVID-19 Antigen Test Procedure
  1. Twist off the cap of the buffer bottle, carefully dispense all buffer into the extraction tube。 
  2. After collecting upper respiratory sample with nasal swab, insert the swab into the extraction tube, plunge the swab up and down in the fluid for a minimum of 10 seconds. Hold the swab against the bottom of the tube, rotate three turns. DO NOT splash liquid out of the tube. 
  3. Remove the swab while squeezing the sides of the tube to extract the liquid from the swab. 
  4. Press the nozzle cap firmly onto the extraction tube. Mix thoroughly by swirling or flicking the bottom of the tube. 
  5. Gently squeeze the tube’s rigid body, dispense two (2) drops of the buffer-specimen mixture into the sample well on the coronavirus antigen test cassette.
  6. Read the test results between 15 and 20 minutes. Do not read the results after 20 minutes.

Please check Instructions for Use for complete procedure

JOYSBIO COVID 19 Antigen Test Operation Procedure

COVID-19 Antigen Test Operation Procedure

Interpretation of Test Results
  • NEGATIVE: A colored band appears on the control line (C line); no colored band shows up on the test line (T line). A negative result indicates there is no coronavirus antigen (N protein) in the specimen, or the level of coronavirus antigen is below the detection limit.
  • POSITIVE: A colored band appears on the control line (C line), a second colored band shows up on the test line (T line). A positive result indicates the presence of COVID-19 antigen (N protein) in the patient sample. 
  • INVALID: No colored band appears on the control line (C line). An invalid test result suggests there might be insufficient buffer volume or incorrect operating procedures. Carefully review the test procedure and test the same patient again with another coronavirus antigen rapid test cassette. Contact your distributor if the problem persists.

Coronavirus Antigen (Ag) Rapid Test Kit Result Interpretation

COVID-19 Antigen (Ag) Rapid Test Kit Result Interpretation

Production Capacity and Standards

As one of the largest lateral flow assay manufacturers in China, JOYSBIO Biotechnology currently produces over 3,000,000 test kits per day to help healthcare professionals all over the world to expand COVID-19 antigen test capacity. JOYSBIO is a ISO 13485 certified manufacturer, the following quality management systems are implemented to ensure the delivery of high-quality lateral flow rapid diagnostic test kits.

EN ISO 13485:2016 EN ISO 18113-2:2011
EN ISO 14971:2012 EN ISO 23640:2016
EN ISO 15223-1:2016 EN 13975:2003
EN ISO 18113-1:2011 EN 13612:2002
It has been produced in accordance with the specifications set by the European Commission (Council Directive 98/79/EC) on In-Vitro Diagnostic Medical Devices (IVDD 98/79/EC Annex III).
  • CE-IVD
  • FDA
  • EUA

JOYSBIO lateral flow test factory

JOYSBIO lateral flow test factory
For further information and inquiries, please feel free to contact us at +30 210 3218720 or to email us at
2 Via Dei Gorini, 6901, Lugano
11 Zinonos Sozou str., 1075, Nicosia
6 Panepistimiou str., 10671 Athens Greece
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