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CoronaChek™ Rapid COVID-19 Tests

Manufactured by Hangzhou Biotest Biotech Co.,Ltd.


NOT diagnostic

Antibody tests are NOT the recommended test for diagnosis. The nasal swab PCR tests detect the actual presence of SARS-CoV2. Locally, WhidbeyHealth offers these:
Beginning Wednesday, April 15th, individuals over the age of five AND who have symptoms will be registered for drive-through testing. To find out if you should be tested call the WhidbeyHealth Coronavirus Hotline at 360-240-4055. Hotline hours are Monday through Thursday 8 AM to 4 PM and Friday 8 AM to Noon.


Youtube video of how to perform the IgG/IgM rapid test


See how a lateral flow immunoassay works


How Do the COVID-19 Coronavirus Tests Work?


***Immunoglobulin tests for COVID-19 cannot confirm the presence of the virus in your system. It can only tell whether you have been exposed in the past or if you have never been exposed to SARS-CoV-2. Consequently, it should only be used alone as a screening test and should be used in tandem with a genetic-based test to determine a complete status. Genetic testing is the gold standard for COVID-19 diagnosis.


Why Do We Need Antibody Tests for COVID-19 and How to Interpret Test Results


FDA rapid test fact sheet


Important Information on the Use of Serological (Antibody) Tests for COVID-19 - Letter to Health Care Providers


What is an IgM and What is an IgG? 

Upon infection with the SARS-CoV-2 virus, the patient’s immune system tries to fight the virus by producing blood-circulating molecules known as antibodies. IgM is a class of antibodies that appears early after an infection (as early as 3-5 days). IgM is the body’s first line of defense against a foreign antigen. IgG is another class of antibodies that appears later and gradually replaces the IgM antibodies. Usually, IgG antibodies appear in the blood circulation within 3-4 weeks after initial infection. The presence of SARS-CoV-2-specific IgM and/or IgG antibodies in the blood of a patient is a strong indication that the patient has been infected with the SARS-CoV-2 virus.



  • Sensitivity (also called the true positive rate, the recall, or probability of detection[1] in some fields) measures the proportion of actual positives that are correctly identified as such (e.g., the percentage of sick people who are correctly identified as having the condition).

  • Specificity (also called the true negative rate) measures the proportion of actual negatives that are correctly identified as such (e.g., the percentage of healthy people who are correctly identified as not having the condition).