Table 4. Number of blood cultures, BC yield, contamination rate, and NND per department.
| Department | BC n (%) | Positive n (%) | True Positive n (%) | False Positive n (%) | NND |
|---|---|---|---|---|---|
| EDa | 1,193 (30.7%) | 208 (17.4%) | 136 (11.4%) | 72 (6.0%) | 9 |
| Hematology | 540 (13.9%) | 70 (13.0%) | 32 (5.9%) | 38 (7.1%) | 17 |
| ICUb | 476 (12.2%) | 77 (16.2%) | 19 (4.0%) | 58 (12.2%) | 26 |
| AMUc | 283 (7.3%) | 21 (7.4%) | 10 (3.5%) | 11 (3.9%) | 29 |
| Surgery | 190 (4.9%) | 19 (10.0%) | 11 (5.8%) | 8 (4.2%) | 18 |
| Oncology | 160 (4.1%) | 16 (10.0%) | 9 (5.6%) | 7 (4.4%) | 18 |
| CCUd | 156 (4.0%) | 26 (16.7%) | 17 (10.9%) | 9 (5.8%) | 10 |
| ANG/URO/NEPHe | 155 (4.0%) | 21 (13.5%) | 12 (7.7%) | 9 (5.8%) | 13 |
| Internal Medicine | 136 (3.5%) | 13 (9.6%) | 7 (5.1%) | 6 (4.5%) | 20 |
| Cardiology | 119 (3.1%) | 16 (13.4%) | 12 (10.1%) | 4 (3.3%) | 10 |
| Neurology | 117 (3.0%) | 11 (9.4%) | 6 (5.1%) | 5 (4.3%) | 20 |
| MCUf | 110 (2.8%) | 22 (20.0%) | 6 (5.5%) | 16 (14.5%) | 19 |
| Pulmonology | 80 (2.1%) | 6 (7.5%) | 3 (3.8%) | 3 (3.7%) | 27 |
| Neurosurgery | 45 (1.2%) | 3 (6.7%) | 1 (2.2%) | 2 (4.5%) | 45 |
| ENTg | 44 (1.1%) | 5 (11.4%) | 5 (11.4%) | 0 (0.0%) | 9 |
| Gynecology | 37 (0.9%) | 1 (2.7%) | 0 (0.0%) | 1 (2.7%) | - |
| Obstetrcs | 28 (0.7%) | 1 (3.6%) | 1 (3.6%) | 0 (0.0%) | 28 |
| SSUh | 21 (0.5%) | 5 (23.8%) | 3 (14.3%) | 2 (9.5%) | 7 |
BC = blood culture. NND = number needed to draw.
aEmergency Department
bIntensive Care Unit
cAcute Medical Unit
dCoronary Care Unit
eAngiology/Urology/Nephrology
fMedium Care Unit
gEar/Nose/Throat
hShort Stay Unit.