What is a PCR test?
A polymerase chain response (PCR) test is carried out to detect genetic material from a particular organism, such as a virus. The test detects the presence of a virus if you are contaminated on the time of the test. The test may additionally detect fragments of virus even after you’re no longer infected.
What’s a COVID-19 PCR test?
A PCR test for COVID-19 is a test used to diagnosis people who find themselves at the moment infected with SARS-CoV-2, which is the coronavirus that causes COVID-19. The PCR test is the “gold customary” test for diagnosing COVID-19 because it’s the most accurate and reliable test.
Who ought to get tested for COVID-19?
You probably have signs of COVID-19.
In case you have been within six feet of someone for 15 minutes or more who has tested positive for Covid-19. (Note: some testing sites don’t offer testing when you’ve been uncovered but don’t have symptoms.)
How does a COVID-19 PCR test work?
There are three key steps to the COVID-19 PCR test: 1) sample assortment, 2) extraction, and three) PCR.
Sample collection is done using a swab to collect respiratory materials present in your nose. A swab accommodates a soft tip on a long, versatile stick that’s inserted into your nose. There are totally different types of nostril swabs together with nasal swabs that gather a sample immediately inside your nostrils and nasopharyngeal swabs that go further into the nasal cavity for collection. Either type of swab is ample for collecting materials for the COVID-19 PCR test. After collection, the swab is sealed in a tube and then sent to a laboratory.
When a laboratory technologist receives the sample, they perform a process called extraction, which isolates genetic material from the pattern together with genetic material from any virus which may be present.
The PCR step then uses particular chemical substances and a PCR machine, called a thermal cycler, which cause a reaction to occur that makes hundreds of thousands of copies of a small portion of the SARS-CoV-2 virus’s genetic material. During this process, one of the chemicals produces a fluorescent light if SARS-CoV-2 is present within the sample. This fluorescent light is a “signal” that is detected by the PCR machine and particular software is used to interpret the signal as a positive test result.
RESULTS AND FOLLOW-UP
What do COVID-19 PCR test results imply?
A positive test consequence means that it could be very likely that you’ve got COVID-19. Most people have delicate sickness and may recover safely at house without medical care. Contact your healthcare provider in case your signs get worse or you probably have questions or concerns.
A negative test end result means you probably did not have COVID-19 at the time you took your test. Nevertheless, it is feasible to be contaminated with SARS-CoV-2 however not have sufficient virus in your body to be detected by the test. For instance, this could occur for those who not too long ago became infected however you don’t have symptoms, yet; or it might occur when you’ve had COVID-19 for more than a week before being tested. Keep in mind that a negative test doesn’t mean you’re safe for any length of time. You might be uncovered to COVID-19 after your test, get infected and spread the SARS-Cov-2 virus to others.
If your test is positive, talk with your healthcare provider, keep residence and separate your self from others. In case your test is negative, continue to take steps to protect your self and others from getting COVID-19. Read more about what to do if you happen to test positive and ways to stop getting infected with COVID-19.
How soon are results of a COVID-19 PCR test available?
You must obtain the outcomes of your test as early as 24 hours after pattern collection, however someday it can take just a few days relying on long it takes the pattern to succeed in the laboratory and what number of different samples are in the queue to be tested.
What are the advantages of a COVID-19 PCR test?
The main advantages of COVID-19 PCR test are its accuracy and reliability. It is the most accurate test available for COVID-19 detection.
Are there downsides to a COVID-19 PCR test?
Because the test is able to detect very small amounts of virus materials, it can continue to detect fragments of SARS-CoV-2 virus even after you’ve recovered from COVID-19 and are no longer contagious. So it’s possible you’ll proceed to test positive you probably have had COVID-19 in the distant previous, even though you possibly can’t spread the SARS-CoV-2 virus to others.
How does the COVID-19 PCR test examine with other available COVID-19 tests?
Basically, there are two types of tests, diagnostic tests and antibody tests. Diagnostic tests tell you if you have an active (current) COVID-19 infection. Antibody tests tell you that you simply already had COVID-19.
PCR test: This tests for the presence of the actual virus’s genetic materials or its fragments as it breaks down. This is the most reliable and accurate test for detecting active infection.
Antigen test: This test detects bits of proteins on the surface of the virus called antigens. Antigen tests are typically considered rapid, taking only 15 to 30 minutes but are less accurate than a PCR test. Speedy antigen tests are most accurate when used within a couple of days of the start of your signs, which is when the largest quantity of virus is current in your body. Because this test shouldn’t be as accurate as a PCR test, if an antigen test is negative, your healthcare provider might order a PCR test to verify the negative test result.
Antibody (serology) test: This tests detects if you happen to’ve had an immune response (antibodies) to the virus. This implies that you’ve had the virus and your body (immune system, specifically antibodies) has mounted an attack to struggle it. The test is detecting those antibodies. It typically takes a couple of week after being contaminated for enough antibodies to develop to be detected in your blood. For this reason, this test shouldn’t be used to diagnose an active infection.
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