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A comparison of the characteristics of the available breath research techniques.
| Analytical Method | Mode of operation | Limit of detection (LOD) | Sensitivity | Specificity |
|---|---|---|---|---|
| SIFT-MS | Direct/Real time | ppbv | High | High |
| PTR-MS | Direct/Real time | pptv | High | Medium-High |
| IMS | Real-time | ppbv | Medium | Medium |
| Sensor arrays | Reference to a database | ppbv | Medium | Medium |
| GC-MS | Pre-concentration | pptv-ppbv | Very-high | Very-high |
| LAS | Real-time | ppbv | High | High |
