Skip to content


Your cart is empty

Article: How Accurate Are PCR COVID-19 Tests?

How Accurate Are PCR COVID-19 Tests?

How Accurate Are PCR COVID-19 Tests?

Are PCR tests accurate? The short answer is YES!

One of the most used diagnostics for coronavirus detection is the PCR or Swab test.

However, as with any medical procedure, patients must remember that this test is not entirely accurate. This implies a false positive or negative result may occur for various reasons.

If you are skeptical of the PCR COVID test accuracy, here is the place to be!

In this post, we'll talk about some of the most typical causes of test findings that aren't correct. 

The information provided will enable you to decide intelligently whether or not to undergo a PCR COVID-19 test.

Let's begin.

How Accurate Are PCR COVID-19 Tests?

The polymerase chain reaction (PCR) tests are considered very accurate for COVID-19.

Like the FlowFlex COVID-19 test, the CPR can identify even small amounts of the virus's genetic material in a sample collected from the nose or throat.

The sensitivity of PCR tests is estimated to be around 95-97%, meaning that the test correctly identifies a positive case in 95-97 out of 100 people who have the virus. The specificity of PCR tests is also high, estimated to be around 98-99%. The test correctly identifies a negative case in 98-99 out of 100 people who do not have the virus.

Nevertheless, the specific test and the environment in which it is performed may impact the PCR COVID test accuracy.

It is also crucial to note that a negative PCR test does not always mean that the patient doesn't have the virus. The test may miss a small proportion of the COVID-19 virus, particularly if the individual is just beginning to feel ill or the viral load is low. 

Possible Reasons for False Positives

A handful of factors might lead to a false positive COVID-19 PCR test result. 

The most common are:

Contamination: False positives can occur if the test is contaminated with genetic material from the virus, which can happen during the collection, handling, or processing of the sample.

Cross-reactivity:  If PCR test detects coronaviruses other than those that cause the common cold, they may provide a false-positive result.

False primers: PCR tests use primers, which are short stretches of genetic material that bind to specific regions of the virus's genetic material. If the primers used in a test are not specific to the virus that causes COVID-19, the test may produce a false positive result.

Human Factors: Some false positive findings may be the consequence of human error, such as improper sample handling, incorrect sample labeling, or incorrect test result interpretation.

Inaccurate test kit: There is a possibility that the test kit itself is not accurate, the manufacturer may have made a mistake, or the test kit has expired. 

Early false positives: The PCR test may provide a false positive result because the viral load is low in the early stages of illness. This is because a higher viral load improves the PCR test accuracy.

It is important to note that a false positive result does not always mean that the test was flawed or that the person who tested positive did not really have COVID-19. 

False positives can occur with any test, and the overall accuracy of PCR tests for COVID-19 is still very high.

Confirmatory testing, such as a repeat PCR test or another kind of test, may be used to support the results.

Possible Reasons for False Negatives

A COVID-19 PCR test may come out as a false negative for several reasons. Some of these include:

Low viral load: When a person's body has a viral load that is too low for the test to detect, false negative findings may also occur.

If the sample taken from the individual is of poor quality or quantity, which may happen if the sample is improperly collected or maintained, false negative findings may ensue.

Additionally, the accuracy of the test may be falsely negative if the test kit is old, damaged, or incorrectly stored.

Human error may also result in false negative results if the test is administered, handled, read, or interpreted incorrectly.

Finally, the virus comes in several strains, and certain test kits may be unable to distinguish between them.

However, one must note that a false negative result doesn't mean the test is unreliable or that the person who tested negative does not have COVID-19. 

As with any test, false negative findings are possible. In case of a questionable or inconclusive test result, a repeat test or buying a Healgen antigen test kit can help confirm the results. 


PCR tests for COVID-19 are considered very accurate, with a sensitivity of around 95-97% and a specificity of around 98-99%. However, it is important to remember that the COVID-19 PCR test accuracy can vary depending on the specific test and the conditions under which it is performed. 

Factors such as:

  • the quality of the test kit
  • the training and experience of the person administering the test
  • and the timing of the test can all affect the accuracy of the results

Additionally, a negative PCR test does not necessarily mean that a person is not infected with the virus, as the test may miss in a few cases, particularly if the person is in the early stages of infection or if the viral load is low. 

Therefore, it is important to continue following recommended public health measures even if you test negative for COVID-19. Remember, you can always buy a lateral flow test to know your status in minutes.

Read more

What Is the Minimum Age for Lateral Flow Test?

What Is the Minimum Age for Lateral Flow Test?

COVID-19 has spread worldwide, and unfortunately, even children can get it. Young people, particularly children, who get infected with the virus, do not experience the symptoms as adults do. They o...

Read more
What Are Saliva Tests for COVID-19?

What Are Saliva Tests for COVID-19?

If you are just catching wind of the spit test for COVID-19 and want to learn more, you have come to the right blog post! Saliva testing for COVID-19 is a relatively new and promising diagnostic me...

Read more