At-home diagnostics can support early action, but they should be used exactly as instructed and interpreted cautiously. Antigen tests are convenient, while molecular/NAAT options are generally more sensitive.
- When to test: test promptly if symptomatic; after exposure, timing matters to reduce false reassurance.
- Repeat antigen testing matters: if an early test is negative, repeat testing at 48-hour intervals improves detection confidence.
- Interpretation: a positive test should be treated as actionable; a single negative antigen test does not reliably exclude infection.
- High-risk contact windows: test before close contact with older adults or immunocompromised people when feasible.
- Safety and handling: follow kit instructions exactly, store properly, and keep test chemicals away from children and pets.
For the latest authorized products, repeat-test schedules, and handling guidance, use the live FDA page: Home COVID-19 Diagnostic Tests: Frequently Asked Questions.