Positive and negative test results predicted for our patients if the best-performing rapid NAAT and POC tests had been used
| Actual and predicted performance of different chlamydia assays | |||||
|---|---|---|---|---|---|
| Actual outcomes* | GeneXpert best† | GeneXpert worst† | CRT best† | CRT worst† | |
| True +ve | 100 | 98–99 | 97–98 | 87 | 41 |
| False +ve | – | 0 | 2 | 7 | 191 |
| True −ve | 1737 | 1737 | 1735 | 1730 | 1546 |
| False −ve | – | 1–2 | 2–3 | 13 | 59 |
| Actual and predicted performance of different gonorrhoea assays | |||||
| Actual outcomes* | GeneXpert best† | GeneXpert worst† | GC Check best† | GC Check worst† | |
| True +ve | 100 | 98–100 | 96 | 70 | 54 |
| False +ve | – | 0 | 5 | 92 | 137 |
| True −ve | 4575 | 4575 | 4570 | 4483 | 4438 |
| False −ve | – | 0–2 | 4 | 30 | 46 |
*The actual results obtained in our patients using the BD ProbeTec assay.
†Predicted outcomes if these assays had been used in the clinic.
CRT, chlamydia rapid test; GC, gonococcal infection; NAAT, nucleic acid amplification technique; POC, point-of-care.