RT-PCR, rapid molecular assays, and rapid antigen tests are all conducted through nasopharyngeal swabs to obtain a sample of respiratory fluid from a patient. As such, COVID-19 diagnostic tests are performed by inserting a long and thin cotton-tipped swab into the nose or back of the patient’s throat to obtain a sample of respiratory fluid. With RT-PCR tests, the sample of respiratory fluid is sent to a medical laboratory for analysis. In order for the lab technician to properly analyze the sample, they must perform a process of extraction, during which the technician will isolate and extract the genetic material from the sample. The genetic material is then placed in a PCR machine, known as a thermal cycler, with special chemicals to trigger a chemical reaction that creates millions of copies of the sample’s genetic material. If the SARS-CoV-2 virus is present in the sample, the chemicals will produce a fluorescent light to signal a positive result. In total, RT-PCR tests take approximately 48 to 72 hours to return results to patients. Rapid molecular assays follow a similar process to RT-PCR tests but can determine a positive or negative result in 13 minutes or less. With that being said, rapid molecular assays are generally not as accurate as RT-PCR tests. Rapid antigen tests examine samples of respiratory fluid by mixing the sample with a solution that releases specific proteins from the virus. The mixture is applied to a paper testing strip containing an antibody that will bind to any existing proteins of the SARS-CoV-2 virus in the sample. This binding process will create a visual reaction on the testing strip. Rapid antigen tests typically return results within 15 minutes of obtaining the sample. We welcome you to come to Sunset Hills Family Practice for a COVID-19 testing appointment if you think you are having COVID-19 symptoms or are at high risk of being infected with the SARS-CoV-2 virus. For an appointment, please call us or schedule an appointment through our website. We serve patients from Henderson NV, Midway NV, Gibson Springs NV, Paradise Hills NV, and Winchester NV.