Almost all at-home tests were lateral flow ... a positive RAT test. RATs were designed to be taken multiple times in sequence. A PCR, also known as a NAAT or molecular test, measures RNA and can ...

You can exhibit COVID-19 symptoms yet test negative due to early infection, low viral load, or immune response. PCR testing ...

Free at-home Covid tests can be ordered starting Monday. Here’s what you should know about when to test and what the results mean as new variants circulate.

Why might a test be negative? Though that may well change in the future, in the meantime, there are a number of reasons why a test might not work even if someone does have COVID-19.

Should I report a negative lateral flow result? The public is instructed to report every result from a lateral flow test, no matter whether its positive or negative.

If you test negative for COVID, can you be contagious? It depends. Here's what to know about COVID testing in 2024, and what your COVID test results may mean.

In the 1990s, scientists started using molecular tests, including PCR and antigen tests that were not quite like today’s lateral flow assays. These tests still required instrumentation, but they were ...

As Covid infections reach a record high in the UK, many will be testing themselves to see if they have fallen victim to the virus. Even though free testing for millions has ended in England, testing ...