Evaluation of Blood Culture System for Culture of Body Fluids

Park, Soon Deok; Uh, Young; Jang, In Ho; Hong, Maria; Lee, Hyeun Gyeo; Lee, Kwan Soo; Lee, Dong Hyun

Abstract

BACKGROUND
Invasive and life-threatening infections such as meningitis, pericarditis, peritonitis, empyema, and septic arthritis are diagnosed via culture of relevant body fluids (BFs). The blood culture system (BCS) has been reported to be a useful alternative for BFs culture to enhance recovery of fastidious microorganisms and reduce detection time. The aim of this study was to evaluate the diagnostic performance of BCS as compared to conventional culture method (CCM) in terms of culture yield.
METHODS
The samples collected between October 2011 and September 2012 were processed using CCM, while those collected between October 2012 and September 2013 were processed using BCS. The 2 processes were compared in terms of total number of requests, recovery rate, turnaround time (TAT), and detection time.
RESULTS
The positive rate using CCM was 18.2% (575/3,151), where 845 isolates were recovered from 575 specimens. Using BCS, the positive rate was 28.3% (922/3,260), where 1,472 isolates were recovered from 922 specimens. While comparing the 2 methods on terms of yield of clinically significant isolates, a greater number of fungi (1.2%) and anaerobic bacteria (1.4%) were recovered using BCS as compared to using CCM. The difference in TAT for positive samples was 24 hours and 40 minutes, where BCS had a shorter TAT than CCM. The mean detection time of 951 positive samples by BCS was 19 hours and 56 minutes. Growth of clinically significant isolates was detected within 24 hours.
CONCLUSIONS
BCS for culture of BFs showed an improvement in recovery rate, number of isolates, and TAT as compared to CCM. Thus, BCS is a suitable alternative for culture of BFs.