Table 3.

Peripheral total leukocyte counts related to false signaling of BACTEC 9240 blood culture system

Leukocyte levelbNo. of blood culture samples with indicated reading/no. sampled (%)
Instrument false positiveInstrument true positiveInstrument true negative
Low2/73 (3)8/43 (19)1/20 (5)
Normal20/73 (27)17/43 (40)8/20 (40)
High51/73 (70)a 18/43 (42)a 11/20 (55)a
  • a Statistically significant (P = 0.001) .

  • b Low, <3.5 × 109/liter; normal, 3.5 × 109 to 10.5 × 109/liter; high, >10.5 × 109/liter.