antigentesters

Antigentesters are diagnostic devices designed to detect specific antigens, usually viral proteins, produced during an active infection. They are commonly used for rapid, point-of-care screening and can deliver results within minutes. The most widespread form is the lateral flow immunoassay, where a sample such as a nasal swab or saliva flows along a test strip. If the target antigen is present, antibodies on the strip bind it and produce a visible line or signal, often with a color change. Some tests use electronic readers to improve result interpretation.

These tests are employed across a range of diseases, notably respiratory infections such as SARS-CoV-2, influenza, and RSV, as well as other pathogens. They are valued for speed, ease of use, and minimal equipment requirements, enabling home testing, clinics, workplaces, and screening at events. However, antigentesters generally have lower analytical sensitivity than nucleic acid amplification tests, particularly when viral loads are low or early in infection. Negative results in symptomatic individuals or those with known exposure may require confirmation with more sensitive methods.

Performance is influenced by specimen type and collection quality, handling, and adherence to manufacturers’ instructions. Specificity is usually high, but false positives can occur, and predictive values depend on disease prevalence. Regulatory approval and labeling vary by country, and many antigentesters are approved for self-use with guidance on when to seek medical advice or follow-up testing.