Table 7 Positive predictive values of Crossing point (Cp) values with different cut-off limits for detection of severe sepsis/septic shock, for blood samples with a positive SeptiFast test for Gram-negative bacteria
Cut-off Cp value | Escherichia coli(n = 33) | Klebsiella pneumoniae/oxytoca(n = 13) | Gram-negative bacteria, other* (n = 11) | Gram-negative bacteria total (n = 57) |
|---|---|---|---|---|
<15.0 | 100% (3/3) | 100% (1/1) | 0% (0/1) | 80% (4/5) |
<17.5 | 100% (5/5) | 100% (2/2) | 0% (0/1) | 88% (7/8) |
<20.0 | 37% (5/11) | 100% (2/2) | 0% (0/2) | 47% (7/15) |
<22.5 | 30% (7/23) | 29% (2/7) | 20% (1/5) | 29% (10/35) |
<25.0 | 30% (8/27) | 22% (2/9) | 33% (3/9) | 29% (13/45) |
>25 | 24% (8/33) | 15% (2/13) | 27% (3/11) | 23% (13/57) |