COVID-19 and PCR Testing

What’s a PCR test?

A polymerase chain response (PCR) test is carried out to detect genetic materials from a particular organism, akin to a virus. The test detects the presence of a virus if you’re infected at the time of the test. The test could additionally detect fragments of virus even after you might be not infected.

What is a COVID-19 PCR test?

A PCR test for COVID-19 is a test used to diagnosis people who find themselves at present 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 probably the most accurate and reliable test.

Who should get tested for COVID-19?

Get tested:

When you’ve got symptoms of COVID-19.

When you’ve got been within six ft of somebody for quarter-hour or more who has tested positive for Covid-19. (Note: some testing sites don’t provide testing in the event you’ve been exposed however 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 3) PCR.

Sample collection is finished utilizing a swab to collect respiratory material present in your nose. A swab contains a soft tip on an extended, flexible stick that’s inserted into your nose. There are different types of nose swabs including nasal swabs that collect a sample immediately inside your nostrils and nasopharyngeal swabs that go additional into the nasal cavity for collection. Either type of swab is enough for accumulating material for the COVID-19 PCR test. After collection, the swab is sealed in a tube after which sent to a laboratory.

When a laboratory technologist receives the pattern, they carry out a process called extraction, which isolates genetic material from the pattern including genetic materials from any virus that 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 tens of millions of copies of a small portion of the SARS-CoV-2 virus’s genetic material. During this process, one of many chemical substances produces a fluorescent light if SARS-CoV-2 is present within the sample. This fluorescent light is a “signal” that’s detected by the PCR machine and special software is used to interpret the signal as a positive test result.


What do COVID-19 PCR test results imply?

A positive test end result means that it may be very likely that you’ve got COVID-19. Most people have delicate sickness and might recover safely at residence without medical care. Contact your healthcare provider if your signs worsen or when you’ve got questions or concerns.

A negative test outcome means you probably didn’t have COVID-19 on the time you took your test. However, it is possible to be contaminated with SARS-CoV-2 but not have enough virus in your body to be detected by the test. For instance, this might occur for those who just lately turned infected however you don’t have symptoms, yet; or it may occur when you’ve had COVID-19 for more than a week earlier than being tested. Keep in mind that a negative test doesn’t imply you might be safe for any size of time. You can 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, stay residence and separate your self from others. In case your test is negative, proceed to take steps to protect yourself and others from getting COVID-19. Read more about what to do should you test positive and ways to stop getting infected with COVID-19.

How quickly are outcomes of a COVID-19 PCR test available?

You should receive the outcomes of your test as early as 24 hours after sample assortment, however sometime it can take a number of days relying on lengthy it takes the pattern to achieve the laboratory and how many 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 quantities 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 you might continue to test positive if in case you have had COVID-19 in the distant past, though you 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 types of tests, diagnostic tests and antibody tests. Diagnostic tests let you know if you have an active (present) COVID-19 infection. Antibody tests tell you that you already had COVID-19.

Diagnostic tests:

PCR test: This tests for the presence of the actual virus’s genetic materials or its fragments as it breaks down. This is essentially 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 speedy, taking only 15 to half-hour but are less accurate than a PCR test. Rapid antigen tests are most accurate when used within just a few days of the start of your signs, which is when the largest quantity of virus is current in your body. Because this test is not as accurate as a PCR test, if an antigen test is negative, your healthcare provider could order a PCR test to substantiate the negative test result.

Antibody test:

Antibody (serology) test: This tests detects for those who’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 combat it. The test is detecting these antibodies. It typically takes about a week after being contaminated for sufficient 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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