Ann Clin Microbiol 2020;23:191-199. Causes and Clinical Relevance of Inconclusive SARS-CoV-2 Real-Time Reverse TranscriptionPCR Test Results
| Lot No. | Period of use | No. of inconclusive result / No. of tests (%) | Result of retest | Ct values of E gene* |
|---|---|---|---|---|
| RP4520C12 | 2020.03.01. – 2020.03.13. | 0 / 3944 (0) | All negative | 19.98 ± 0.45 |
| RP4520C15 | 2020.03.12. – 2020.03.25. | 0 / 4324 (0) | All negative | 19.90 ± 0.37 |
| RP4520C20 | 2020.03.26. – 2020.04.11. | 20 / 7341 (0.27) | All negative | 19.97 ± 0.27 |
| RP4520C27 | 2020.04.10. – 2020.04.28. | 16 / 7087 (0.23) | All negative | 19.63 ± 0.23 |
| RP4520D50 | 2020.04.29. – 2020.05.12. | 0 / 4334 (0) | All negative | 19.75 ± 0.34 |
| RP4520D68 | 2020.05.11. – 2020.05.26. | 5 / 5657 (0.088) | All negative | 19.97 ± 0.20 |
| RP4520E81 | 2020.05.24. – 2020.06.22. | 3 / 7967 (0.038) | All negative | 19.21 ± 0.38 |
| RP4520E89 | 2020.06.21. – 2020.06.30. | 0 / 2614 (0) | All negative | 19.02 ± 0.41 |
* The average Ct values of E gene of positive control.
Abbreviations: COVID-19, coronavirus disease 19; N, number; Ct, cycle threshold; E, envelope.