First, the person with a positive Antigen-RDT could meet a "probable case definition" such as having recent loss of smell or taste without any known cause, or could meet certain "suspect criteria" such as having a severe acute respiratory illness. The World Health Organization (WHO) COVID-19 Case Definition states that a person with a positive RAT (also known as an antigen rapid diagnostic test or Antigen-RDT) can be considered a "confirmed case of SARS-CoV-2 infection" in two ways. Uses Use in diagnosis ĬOVID-19 rapid antigen tests (RATs) have been widely used for diagnosis of COVID-19. The tests are more sensitive in the symptomatic and transmissive stages of disease when the viral load is higher. Despite this, COVID-19 RATs remain valuable in finding people who would otherwise not know they were infected, helping to prevent further transmission. However, the tests have a sensitivity of 70%-72%, which is lower than COVID-19 polymerase chain reaction (PCR) tests' sensitivity of 88%-96%. įalse positives are very rare the tests' specificity is 98%-99%. Many RATs can be used for self-testing, in which an individual "collects their own specimen… and interpret their test result themselves". RATs have been used in several countries as part of mass testing or population-wide screening approaches. They are quick to implement with minimal training, cost a fraction of other forms of COVID-19 testing, and give users a result within 5–30 minutes. To diagnose SARS-CoV-2 infections ( COVID-19)ĬOVID-19 rapid antigen tests or RATs, also frequently called COVID-19 lateral flow tests or LFTs, are rapid antigen tests used to detect SARS-CoV-2 infection ( COVID-19). SARS-CoV-2 or COVID-19 antigen test, rapid antigen detection test (RADT), lateral flow test (LFT), lateral flow device (LFD), antigen-detecting rapid diagnostic test (Ag-RDT), antigen rapid diagnostic test (Antigen-RDT), point of care (POC) test, rapid test Negative (left, showing Control line) and positive (right, showing Control and Test lines) results
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