Table 4. Microbiology tests and turn-around times.
| Test | Number of
samples |
Tested positive
n(%) |
Time in hours from laboratory
receipt of specimen to organism identity and bacterial susceptibilities (median, IQR) |
Time in hours from laboratory
receipt of specimen to final report of a negative result (median, IQR) |
|---|---|---|---|---|
| Blood culture | 79 | 8 (10) | 55.0 (43.5 – 72.0) | 120.3 (120.2 – 121.0) |
| CSF culture | 41 | 0 (0) | N/A | 44.2 (42.0 – 49.9) |
| CSF viral PCR | 25 | 0 (0) | N/A | 39.3 (26.4 – 41.2) |
| ETT aspirate culture | 85 | 30 (35) | 102.5 (74.8 – 153.5) | 55.5 (50.9 – 71.1) |
| ETT viral PCR | 20 | 10 (50) | 21.7 (19.7 – 23.4) | 55.0 (38.2 – 64.6) |
| NPA viral PCR | 79 | 62 (78) | 21.6 (15.2 – 25.7) | 23.6 (21.1 – 24.5) |
| NP swab viral PCR | 20 | 16 (80) | 24.4 (20.2 – 29.3) | 23.3 (17.2 – 26.5) |
| Urine culture | 39 | 4 (10) | * | 5.7 (2.7 – 13.8) |
| Total | 388 | 130 (34) |
ETT: endotracheal tube; IQR: interquartile range; N/A: not applicable; NP: nasopharyngeal; NPA: nasopharyngeal aspirate; CSF: cerebrospinal fluid; PCR, polymerase chain reaction. * Insufficient sample size.