Table 2.

Performance Characteristics of RAD Test for the Presence of SARS-CoV-2 in 188 RT-PCR-Positive Specimens

All Specimens					High-Viral-Load Specimens
Ct Value		Number of Specimens			Ct Value		Number of Specimens
Mean	Range	Tested	Positive	Sensitivity	Mean	Range	Tested	Positive	Sensitivity
22	15.8–32.3	188	81	43.1%	18	15.8–25.5	76	71	93.4%

Ct, cycle threshold; RAD, rapid antigen detection; RT-PCR, reverse-transcription polymerase chain reaction. High-viral-load specimens are those with Ct values <25.5 for SARS-CoV-2–specific RT-PCR, and normal viral load specimens are those with Ct values >28.0.