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 zero	BACTEC PLUS concn [μg/ml (%)]	BacT/Alert FA concn [μg/ml (%)]
No vancomycin	0 (0)	0 (0)
Trough (10 μg/ml) vancomycin	0 (0)	8.8 (88)
Mid (25 μg/ml) vancomycin	0 (0)	22.5 (90)
Peak (50 μg/ml) vancomycin	15 (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)