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.