Rapid Strep, Mono and Influenza Tests

Point-of-Care Testing Foundations and Quality Assurance

In the outpatient setting, medical assistants frequently perform rapid diagnostic tests to help clinical teams evaluate acute symptoms. Rapid tests for Group A Streptococcus, infectious mononucleosis, influenza, and COVID-19 are commonly categorized as CLIA-waived tests. Although these point-of-care assays are designed to be straightforward, strict adherence to quality assurance protocols is essential to produce dependable findings. Before initiating any test, the medical assistant must verify the expiration dates of the test cassettes, collection swabs, and chemical reagents. Using expired components can compromise test chemistry and lead to inaccurate patient results.

Reagent and device integrity must also be confirmed before specimen processing begins. Medical assistants verify that test devices and reagents are compatible according to the manufacturer's instructions, noting that their lot numbers do not necessarily have to match. Perform external quality controls in the form specified by the test manufacturer, such as liquid controls or control swabs, at the intervals required by the manufacturer and facility policy, including when required for new lots. External quality control helps verify assay performance, but it does not establish that an individual patient specimen was collected adequately.

Many lateral-flow tests display a procedural control line; for tests with a reader or another control format, follow the manufacturer's instructions to determine whether the test is valid. It is critical to recognize that this internal control line indicates that fluid migrated through the test device as expected; it does not confirm that the specimen was collected adequately. If the internal procedural control line fails to appear after the designated run time, the rapid test result is invalid, and the medical assistant must repeat the test using a completely new device. All point-of-care results must be documented in the designated patient record, and medical assistants must record quality control results and reagent lot numbers as required by facility policy. Medical assistants report rapid test findings directly to the supervising provider and do not independently diagnose conditions or prescribe medications.