References in periodicals archive ?
A comparison of transtracheal aspiration with other methods of determining the bacterial flora of the lower respiratory tract.
Sputum with <25 squamous epithelial cells/low power field (SEC/LPF) had cultures that correlated with transtracheal aspiration cultures 79% of the time, whereas a potential pathogen isolated from sputa with <10 SEC/LPF was 94% predictive of growth in the corresponding transtracheal aspirate.