![]() However, it's possible to have COVID-19 but not have the virus detected by the test. Contact your healthcare provider if your symptoms get worse or if you have questions or concerns.Ī negative test result means you probably didn't have an infection with SARS-CoV-2 at the time your specimen was collected. Most people have mild illness and can recover safely at home without medical care. This could be due to asymptomatic infection, but if you have symptoms, then this infection is called COVID-19. Scientists use special software to interpret the signal as a positive test result.Ī positive test result means that it's likely that you have an infection with SARS-CoV-2. Once amplified enough, the PCR machine can detect this signal. One of the chemicals in the tube produces a fluorescent light if SARS-CoV-2 is present in the sample. After many cycles, millions of copies of a small portion of the SARS-CoV-2 virus’s genetic material are present in the test tube. Each heating and cooling cycle increases (amplifies) the amount of the targeted genetic material in the test tube.
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