Types of Covid-19 detection tests

Even after the pandemic, Covid-19 detection tests are a mechanism used to prevent and control.

Since 2020, screening testing methods and types have changed the way we think about public health.

Types of Covid-19 detection tests

With the tests that exist, it is possible to detect SARS-CoV-2 infection (which causes Covid-19).Thanks to these tests and their response, it was possible to contain the pandemic and have greater control over the situation.


PCR tests

PCR tests are nucleic acid amplification tests (NAAT). This way it is easier to detect the virus.A PCR test is usually taken by a medical provider or specialist. The test is sent to laboratories for analysis to provide results within 3 days.


Antigen tests

Antigen tests are rapid, providing results within 15 to 30 minutes.This type of test is widely used for its precision and reliability to obtain immediate results. Still, antigen tests are less likely to detect the virus than PCR tests when there are no symptoms.


FDA recommendations

The Food and Drug Administration (FDA) recommends that, to be sure that you do not have Covid-19, the following precautions be taken when performing antigen tests:If you present symptoms, 2 antigen tests are recommended. Both would have to test negative to confirm that you do not have the virus.If you do not present symptoms, there would be 3 tests. The three with a negative result would be indicated.Additionally, in either of these two examples, the tests need to be performed 48 hours apart.

Recommendations on Covid-19 testing

What about home tests or self-tests?

Home tests or self-tests have become popular due to their speed and the fact that they can be purchased quickly, as well as their performance.These home tests are for antigens that must be followed with complete adherence to the instructions to provide a reliable and functional detection result.


When should you get a Covid-19 test?

There are several possible scenarios for you to get a Covid-19 test.If you have symptoms of Covid-19.If you lived with someone who turned out to be positive for Covid-19.If you were present in an area where positive cases of Covid-19 were detected.


If you have symptoms, you should do the following:

Take a PCR test to obtain a more reliable result and only have one analysis.

If you use an antigen test, the positive result is reliable, but the negative result is sometimes not accurate. To confirm that you are negative (after taking an antigen test), you must take a second test 48 hours later or a PCR test.


If you do not have symptoms and have been exposed to the virus, you should wait 5 full days after exposure.

If you plan to only have one test, a PCR test would be ideal due to its high reliability and effectiveness.

In the case of antigens, the indication is the same: after taking a test and getting a negative result, wait 48 hours to take a second test. If you have two negatives, wait another 48 hours and do another similar test to confirm that you are negative.


A testing center

Going to a testing center is the most recommended option to clarify your situation and find out if you carry the virus or not.By undergoing a test in a space controlled by health specialists or medical providers, you will be able to corroborate your situation and know that the procedure was done correctly.Between both tests, the most recommended is PCR to have a clear answer. However, if you need a quick response, antigen is a good option.The Centers for Disease Control and Prevention (CDC) has reported that a positive result from antigen tests is reliable, but a negative result would require up to 3 tests 48 hours apart.

What to do if it is positive?

If the Covid-19 detection test gave positive results, regardless of whether it is PCR or antigens, the CDC's indications are as follows:

Isolate yourself and take precautions. Wear a mask to prevent spreading the virus to others.

Inform the people you came into contact with when you became ill with Covid-19 so that they can take their precautions in time.

Stay alert for symptoms and have health service contacts in case of an emergency.

Contact a medical provider for available treatment options and recommendations for your case.