Table 4 Clinical parameters, serum C-reactive protein and procalcitonin levels for diagnosing adult infection in an emergency department (%)
From: Procalcitonin as a marker of bacterial infection in the emergency department: an observational study
Parameter | Sensitivity | Specificity | Positive predictive value | Negative predictive value |
|---|---|---|---|---|
SIRS | 82.8 (48/58) | 57.1 (28/49) | 69.6 (48/69) | 73.7 (28/38) |
White blood cell count >12,000/mm3 or <4000/mm3 | 36.2 (21/58) | 81.6 (40/49) | 70.0 (21/30) | 51.9 (40/77) |
C-reactive protein (cut-off 60 mg/l) | ||||
All | 67.2 (39/58) | 93.9 (46/49) | 92.9 (39/42) | 70.8 (46/65) |
SIRS | 68.8 (33/48) | 90.5 (19/21) | 94.3 (33/35) | 50.9 (19/34) |
No SIRS | 60.0 (6/10) | 96.4 (27/28) | 85.7 (6/7) | 87.1 (27/31) |
Procalcitonin (cut-off 0.6 ng/ml) | ||||
All | 70.7 (41/58) | 63.3 (31/49) | 69.5 (41/59) | 64.6 (31/48) |
SIRS | 70.8 (34/48) | 66.7 (14/21) | 82.9 (34/41) | 50.0 (14/28) |
No SIRS | 70.0 (7/10) | 60.7 (17/28) | 38.9 (7/18) | 85.0 (17/20) |