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Failure to follow the test procedure and interpretations of test results may adversely affect test performance and/or invalidate the test result. A negative result may occur if the level of antigen in the sample is below the detection limit of the test. Test results must be evaluated in conjunction with other clinical data. Negative results do not rule out possible non-COVID-19 viral infections. Positive results do not rule out co-infections with other pathogens. Positive and negative predictive values are highly dependent on prevalence. False negatives are more likely during peak activity when disease prevalence is high, while false positives are more likely during periods of low activity. Thank you. For technical clarifications, please email us at [email protected].