Doesn't sound the best Due to the relatively small sample size for the home use clinical study, the BinaxNOW COVID-19 Antigen Self Test is estimated to correctly identify between 73.0% and 98.9% of positive specimens as reflected in the 95% Confidence Interval. This is consistent with the performance established in a separate multi-site clinical study in the US, where the BinaxNOW COVID-19 Ag Card test was performed and results interpreted by test operators with no laboratory experience. In that study, BinaxNOW COVID-19 Ag Card test correctly identified 84.6% of positive specimens and 98.5% of negative specimens.