TABLE 4.

Mean concentrations and percentages of remaining vancomycin and cefoxitin after 1 h of incubation in BACTEC PLUS and BacT/Alert FA bottles

Amt and type of antibiotic at time zeroBACTEC PLUS concn [μg/ml (%)]BacT/Alert FA concn [μg/ml (%)]
No vancomycin0 (0)0 (0)
Trough (10 μg/ml) vancomycin0 (0)8.8 (88)
Mid (25 μg/ml) vancomycin0 (0)22.5 (90)
Peak (50 μg/ml) vancomycin15 (30)36 (72)
No cefoxitin<10 (0)<10 (0)
Mid (60 μg/ml) cefoxitin<10 (0)43 (71)
Peak (110 μg/ml) cefoxitin<10 (0)77 (70)