Antigen Lateral Flow Assays (LFAs), also simply known as Antigen tests, are another most used tests to diagnose COVID-19. It is popular for being quick, accessible, and inexpensive. Consequently, it is widely accepted among users and the regulatory authorities, allowing many individuals to diagnose themselves at home without visiting the doctor's office. Although its accuracy is lower than the PCR test, some health professionals also utilize the LFAs for quick diagnosis. The technical aspect of the LFAs was established by Plotz and Singer in 1956 from their latex agglutination assay . Since then, this test has been used for quite a time for pregnancy and diseases like HIV, Ebola, malaria, Zika virus, flu variants, water pollutions, and other foodborne contaminants .