Table 3

Diagnostic accuracy of same-day antigen and reverse transcriptase (RT)-PCR testing based on the frequency of PCR testing.

Number
RT-PCR tests/week
True -positive antigen testFalse-negative antigen testFalse-positive antigen testTrue-negative
antigen test
TotalSensitivitySpecificityPositive predictive valueNegative predictive value
115271910 87110 93235.7%
(22.8% to 51.1%)
99.83% (99.73% to 99.89%)44.1% (28.6% to 60.8%)99.75% (99.64% to 99.83%)
221253970398914.3% (3.6% to 42.7%)99.87% (99.70% to 99.95%)28.6% (7.2% to 67.3%)99.70% (99.47% to 99.83%)
321343434345313.3% (3.4% to 40.5%)99.88% (99.69% to 99.96%)33.4% (8.4% to 73.2%)99.62% (99.34% to 99.78%)
4*040105510590.0%100.00%99.62% (98.97% to 99.86%)
5*041124112460.0%99.92%99.62% (98.97% to 99.86%)
6–7*041277827830.0%99.96%99.62% (98.97% to 99.86%)
Total19643023 34923 46222.9% (15.1% to 33.%)9987% (99.81% to 99.91%)38.8% (26.1% to 53.1%)99.73% (99.65% to 99.79%)
  • *Model-based estimates of sensitivity and specificity and corresponding 95% CIs could not be calculated due to no observed true-positives. Raw estimates are provided.