Rapid antigen tests can detect whether proteins of the COVID-19 coronavirus are present in your body.

RATs can sometimes detect COVID-19 before you develop symptoms. They’re not as accurate if you don’t have symptoms and can produce either false negative or false positive results.

The test you do at home is known as a rapid antigen self-test. However, some schools and workplaces test regularly to avoid a COVID-19 outbreak and use rapid antigen point-of-care testing. These tests are carried out by health professionals or trained people working under supervision. They can provide clinical advice and treatment if needed.

Rapid antigen tests are different to rapid antibody self-tests, which can’t be sold for general use in Australia. Rapid antibody tests only show whether a person has been previously infected with COVID-19.

RATs can detect COVID-19 during the ‘acute’ phase of infection — especially just before you show symptoms and in the week after symptoms first appeared. But they’re still not as reliable as PCR tests.

It’s very important to follow the instructions on the packaging in order to get an accurate result.
So, if rapid antigen tests are less reliable than PCRs, and they’re not always free like most PCRs, why have one? Well, there are a few reasons:

RATs are a good solution if you have COVID-19 symptoms but can’t access a PCR testing clinic.

If you want to quickly check if you’re likely to have COVID-19 — such as if you’re about to visit an aged-care facility or go to a party — you could have a RAT.

If your school or employer has a COVID-19 surveillance program in place, you may be asked to have regular rapid antigen point-of-care tests.

You might need to have a RAT if a state or territory health department requires it.

Note: in some situations — such as to meet international travel requirements — having a PCR test may be your only option.

For accurate results, follow the instructions on the packaging.

Ensure the test hasn’t passed the expiry date and that you do it at a particular temperature, if that’s what the instructions say. There’ll also be directions about preparing the surface on which you place the indicator device and how you collect the nasal secretion or saliva sample.

Make sure you read the result at the specified time, too — if you wait too long, the result may no longer be accurate.

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