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Preparation of a Blood Culture Pellet for Rapid Bacterial Identification and Antibiotic Susceptibility Testing
Published on: October 15, 2014
Polymerase chain reaction/electrospray ionization-mass spectrometry (PCR/ESI-MS) is not suitable for rapid bacterial
Cheuk Chun Szeto1,2, Jack Kit-Chung Ng1, Winston Wing-Shing Fung1
1Department of Medicine and Therapeutics, Carol and Richard Yu Peritoneal Dialysis Research Centre, Prince of Wales Hospital, The 26451Chinese University of Hong Kong, Shatin, Hong Kong SAR, China.
Background:
Peritoneal dialysis (PD)-related peritonitis is a serious complication of PD, but routine microbiological culture is slow and could not identify the organism in 15% cases. We examine the accuracy of polymerase chain reaction/electrospray ionization-mass spectrometry (PCR/ESI-MS), a PCR-based method developed for the direct detection of bacteria in blood, for rapid identification of microorganisms from PD effluent.
Methods:
We recruited 73 consecutive patients with PD-related peritonitis. Dialysis effluent was collected for routine bacterial culture, PCR/ESI-MS, and bacterial DNA quantification before initiation of antibiotic therapy.
Results:
By digital PCR with universal bacterial primers, bacterial DNA was detectable in all PD effluent specimens. For the entire cohort, taking standard bacterial culture as the gold standard, the PCR/ESI-MS assay correctly identified 34.3% of the causative organisms, failed to identify any organism in 52.1% cases, and identified a different organism in 8.2% cases. For the 14 episodes of peritonitis that were culture negative by conventional bacterial culture, the PCR/ESI-MS assay identified an organism in only four cases. The detection rate of the IRIDICA BAC BSI assay was not affected by the use of biocompatible PD solution or concomitant exit-site infection.
Conclusions:
The PCR/ESI-MS assay could not identify the causative organism in over 50% of the PD effluent samples in patients with PD-related peritonitis and should be not used for such purpose. The reason for the poor performance needs further investigation.
Insights
Polymerase chain reaction/electrospray ionization-mass spectrometry (PCR/ESI-MS) showed poor accuracy in identifying organisms in peritoneal dialysis (PD) effluent for PD-related peritonitis. This rapid method failed to identify the causative organism in over 50% of cases.
Area of Science:
- Microbiology
- Nephrology
- Molecular Diagnostics
Background:
- Peritoneal dialysis (PD)-related peritonitis is a significant complication.
- Routine microbiological cultures for peritonitis diagnosis are slow and have limitations.
- PCR/ESI-MS offers a potential rapid alternative for microbial identification.
Purpose of the Study:
- To evaluate the accuracy of PCR/ESI-MS for rapid identification of microorganisms in PD effluent.
- To compare PCR/ESI-MS performance against standard bacterial culture in PD-related peritonitis.
Main Methods:
- Recruited 73 patients with PD-related peritonitis.
- Collected dialysis effluent for bacterial culture and PCR/ESI-MS.
- Performed PCR/ESI-MS analysis before antibiotic treatment.
Main Results:
- Bacterial DNA was detected in all samples by digital PCR.
- PCR/ESI-MS correctly identified causative organisms in only 34.3% of cases.
- PCR/ESI-MS failed to identify organisms in 52.1% and identified incorrect organisms in 8.2% of cases.
Conclusions:
- The PCR/ESI-MS assay demonstrated poor performance in identifying causative organisms in PD effluent.
- The assay is not recommended for diagnosing PD-related peritonitis based on current findings.
- Further investigation is required to understand the reasons for the assay's limitations.
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