Abstract
The BACTEC™ FX (BD, USA) has been recently upgraded to measure virtual blood volume (VV) in batches of 25 PLUS Aerobic/F bottles. VVs were compared with manually measured actual volumes (AVs). The mean AV was larger in anaerobic bottles: 2.6±1.9mL in 2995 Aerobic/F bottles and 3.3±1.8mL in 3053 Lytic/10 Anaerobic/F bottles (P<0.001). The VV of Aerobic/F bottles was 2.4±1.4mL, and there was a significant correlation between the VVs and AVs of each department (P<0.001). The potential positivity in aerobic bottles increased 1.2-fold with a 1-mL increase in the AV (P<0.001). AV and VV were consistently less than adequate. Although the proportional effect of volume on positivity can be proven only with the AV, VVs are a reliable substitute for AVs to monitor the overall blood volumes and provide feedback to the individual departments or locations.
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