PCR Test

In the early phases, it is unusual to develop symptoms, because there is still no defense system in the body, this is why the best test is the one that identifies the genetic material of the virus.

The PCR test (Polymerase Chain Reaction) is the primary
test used to detect the Sars-CoV-2 virus that causes the COVID-19 disease in humans.

The PCR test is a molecular biology lab test, and its objective is to find genetic material from pathogens that cause diseases. By taking a small sample of organic material, this material is maximized to identify a specific genetic chain of the agent.

The PCR test is highly specific and efficient at differentiating the virus from other pathogens, and it is highly sensitive even when the pathogen is in minimal quantities and the first phases of the infection.



First curve: it refers to the infection by the virus. This is called the period of viremia. The second curve (soft blue): refers to the elevation of the IGM antibodies. Third curve (red) refers to the IGG antibodies. 

This shows the period, or stage of the disease in which each of the tests can detect the Covid-19 virus.

It is important that the usefulness of each test is identified for each stage of the disease. Normally, Covid-19 can have an incubation period of up to 14 days and remain infectious for up to another 21 days. This is the reason why isolation is recommended to the patient in order to avoid spreading the disease

Considerations for PCR test

  • Do not eat, drink, use mouthwash, or brush your teeth at least three hours before taking the sample. 
  • An official test result is provided with the qualitative results as "Detected" or "Not detected." 
  • If the test is "Not detected," but it is a highly suspicious case, it is suggested that it be retaken. 
  • A medical order is not needed for the PCR test.

Where to Do It?

Medical Group Costamed Locations
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Consejo de Salubridad
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