Table 3.
Results of real-time PCR and DFME on respiratory samples from patients evaluated for pulmonary infection, including PCP, from January 2005 through May 2007a
| Description | Number of tests |
|---|---|
| Testing performed from all respiratory sourcesb | 3271 |
| DFME only: | 2145 total |
| Negative | 2101 (98%) |
| Positive | 44 (2%) |
| Real-time PCR only: | 734 total |
| Negative | 633 (86%) |
| Positive | 101 (14%) |
| Both tests done on same samplec: | 392 total |
| DFME negative, PCR negative | 363 (93%) |
| DFME negative, PCR positive | 29 (7%) |
| Testing performed from BAL fluid only | 1422 |
| DFME only: | 934 total |
| Negative | 910 (97%) |
| Positive | 24 (3%) |
| Real-time PCR only: | 156 total |
| Negative | 140 (90%) |
| Positive | 16 (10%) |
| Both tests done on same samplec: | 332 total |
| DFME negative, PCR negative | 311 (94%) |
| DFME negative, PCR positive | 21 (6%) |
a
Patient samples collected from both Mayo Clinic Rochester and Mayo Medical Laboratories.
b
Respiratory sources include sputum, tracheal secretions, BAL, and bronchial washings.
c
These samples all tested negative by DFME and subsequently had PCR added.