Antibody tests should not be used to identify a COVID-infected patient because antibodies typically stay in the blood long after the infection has cleared. In fact, the presence of antibodies means the person has some protection against the virus.
RT-PCR vs Rapid Antigen Tests
Now that we have a better understanding of antibody tests, let’s talk about the viral tests, which, in the Philippines, are divided into RT-PCR and rapid antigen testing.
RT-PCR, which stands for Reverse Transcription-Polymerase Chain Reaction, uses laboratory equipment to look for the genetic material of SARS-CoV-2. You need to wait for at least 24 hours before you get your result.
On the other hand, rapid antigen tests look for certain proteins attached to the virus. Unlike RT-PCR testing, antigen tests use just a small kit and their results come out after just a few minutes. Hence, we call it a “rapid antigen test.”
Note that RT-PCR testing is more accurate because it is more specific as it looks for the viral genetic material. For a rapid test to be accurate, it has to satisfy certain criteria, such as the time of testing. Testing too early or too late can give you a false-negative result.
Saliva COVID Test vs Nasopharyngeal Swab Test
Usually, when people mention “swab test,” we assume that they’re talking about RT-PCR swab testing. But, that’s not the case. You see, both saliva and swab samples (from throat and nose — nasopharyngeal or NP) can be run through RT-PCR machines or rapid antigen kits.
Comments
Share your thoughts
Be the first to let Hello Doctor know your thoughts!
Join Us or Log In to join the discussion