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Note: This information is only about the test to diagnose COVID-19. It’s not about tests (such as a COVID-19 antibody test) that show if you had COVID-19 in the past.
A COVID-19 test is a way to find out if you have COVID-19. It's a viral test that looks for COVID-19 virus in samples (such as swabs) taken from your nose or throat (breathing passages). There are different types of viral tests:
The antigen test and the ID NOW are not as accurate (correct) as PCR. People who get an antigen or ID NOW test will need to have 2 swabs collected. Antigen and ID NOW test results come back in a few hours. PCR tests may take a few days. Faster PCR testing or ID NOW testing is done for people who are very sick and need hospital care.
This test is used to diagnose a current infection with SARS-CoV-2, the virus that causes coronavirus disease 2019 (COVID-19). Knowing that you have the virus means that you can take steps to protect others from getting infected. This can help limit the spread of the virus.
Knowing who has COVID-19 is also important for public health experts who track the virus. It can help them learn more about how the virus spreads and how to stop it from spreading.
You don't need to do anything to prepare for this test. But be sure to follow any instructions your healthcare provider gives you.
The test is most often done on a sample from the back of your nose (nasopharyngeal) or throat. A sample is usually collected by putting a swab into the back of your nose. If you agree to have an antigen or ID NOW test, you will have 2 samples collected. The first is used for antigen or ID NOW testing. The second is sent to the lab to confirm a negative result with PCR testing or, if the antigen test is positive, test for COVID-19 variants.
While you wait for your COVID-19 test results, stay in your home, and stay away from others. This is called isolation or quarantine. Do this even if you don't feel sick or have any symptoms. Don't leave unless you need medical care. If you can, try to stay in a separate room. This might help you avoid infecting family members or other people you live with.
Follow your doctor's instructions about what to do when you get your results back.
Even if your test is negative, continue to wear a mask and follow physical-distancing guidelines.
A PCR result is either positive or negative. An ID NOW or antigen test result is reported as either positive or result to follow.
A positive result means that the antigen or genetic material of the virus was found in your sample. You have been diagnosed with COVID-19.
Result to follow means that the antigen or genetic material of the virus wasn’t found in your sample. But your sample needs more testing before confirming the test is negative for COVID-19.
A negative result means that the antigen or genetic material was not found. This may mean that you don't have COVID-19.
But it's possible to get a "false-negative" result. This may mean that you don't have COVID-19 when in fact you do. This can happen because:
Because false negative results sometimes happen, you should continue isolating if you have symptoms and follow all public health measures. If you are a close contact of someone who has COVID-19, you must continue to isolate, even if you have a negative result.
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Adaptation Date: 8/20/2021
Adapted By: Alberta Health Services
Adaptation Reviewed By: Alberta Health Services
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