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Types of TestsYou can order free self-test kits at COVIDtests.gov or purchase tests online, in pharmacies, and retail stores.You can also visit FDA's website to see a list of authorized tests.
Accuracy: The BinaxNOW test correctly gave a positive result 84.6% of the time compared to PCR. In the same study, the test correctly gave a negative result 98.5% of the time.
“PCR tests are more reliable and accurate due to testing the specific genetic material of the virus, eliminating the interference from other viruses,” said Heather Seyko, a Laboratory Services manager for OSF HealthCare.
“PCR would be chosen where there is a low likelihood of having the virus, but we want to be certain the patient doesn't have it. Antigen would be chosen if there is a high probability the patient has the virus (i.e. is experiencing symptoms), and we need to screen the patient as positive or negative,” Heather said.
Accuracy: The BinaxNOW test correctly gave a positive result 84.6% of the time compared to PCR. In the same study, the test correctly gave a negative result 98.5% of the time.
PCR tests are more accurate than antigen tests. "PCR tests are the gold standard for detecting SARS-CoV-2," says Dr. Broadhurst. "It is the most accurate testing modality that we have.
Reverse transcription polymerase chain reaction (RT-PCR)-based diagnostic tests (which detect viral nucleic acids) are considered the gold standard for detecting current SARS-CoV-2 infection.
PCR tests are very accurate when properly performed by a health care professional, but the rapid test can miss some cases.
Rapid antigen tests are less accurate when used in people with no symptoms of COVID-19. More evidence is needed to understand the accuracy of rapid testing in people without symptoms and the extent to which repeated testing strategies can lead to reduced transmission, either for tests carried out at home or in non-healthcare settings such as schools.
Some people with mild infections may test negative on an antigen test, but positive on a PCR test. This would mean that they have COVID, but don't have enough virus to turn an antigen test positive.
An antibody test may not show if you have a current infection because it can take 1–3 weeks after the infection for your body to make antibodies.
However, if you perform an at-home COVID-19 antigen test, you could get a false negative result. This means that the test may not detect the SARS-CoV-2 virus that is in your nasal swab sample. This could happen if you test soon after you get an infection, especially if you don't have COVID-19 symptoms.
There is a very small chance that this test can give a positive result that is wrong (a false positive result). Your healthcare provider will work with you to determine how best to care for you based on your test result(s) along with your medical history, and your symptoms.
Reverse transcription polymerase chain reaction (RT-PCR)-based diagnostic tests (which detect viral nucleic acids) are considered the gold standard for detecting current SARS-CoV-2 infection.
Is this test FDA-approved or cleared? No. This test is not yet approved or cleared by the United States FDA. FDA may issue an Emergency Use Authorization (EUA) when certain criteria are met, which includes that there are no adequate, approved, available alternatives.
Some people with mild infections may test negative on an antigen test, but positive on a PCR test. This would mean that they have COVID, but don't have enough virus to turn an antigen test positive.
For the most accurate results, we recommend that people without symptoms receive a PCR test. PCR results are available within 2-3 business days. Antigen (rapid) results are available within two hours.”
Get care for low-level urgent conditions through a video chat with a provider, 24/7, on your computer or mobile device.
All of these testing sites are now able to offer testing to children ages three and older.