Related Experiment Videos
[Urinary microbial load evaluation: comparison of an agar-colony count method and a colorimetric method]
Quaderni Sclavo Di Diagnostica Clinica E Di Laboratorio
|December 1, 1985
Summary
A new Dye test (Dt) for analyzing bacterial quantity in urocultures showed high concordance with the classic colony-count method (CC). The Dt method identified residual antibiotics and specific bacteria like Pseudomonas sp. in discordant samples.
Area of Science:
- Clinical Pathology
- Microbiology
- Diagnostic Methods
Background:
- Uroculture analysis is crucial for diagnosing urinary tract infections.
- Traditional agar colony-count (CC) methods are time-consuming.
- Newer, rapid diagnostic systems are needed to improve efficiency.
Purpose of the Study:
- To evaluate the performance of a new colorimetric Dye test (Dt) against the classic colony-count (CC) method for bacterial quantification in urocultures.
- To establish concordance and identify discrepancies between the two methods.
Main Methods:
- Analysis of 500 urocultures using both the classic agar colony-count (CC) method and the new colorimetric Dye test (Dt).
- Comparison of results based on a 100,000 CFU/ml threshold for CC.
- Concordance analysis to correlate color intensity in Dt with bacterial presence.
Main Results:
- The CC method identified 28.6% positive and 71.8% negative samples.
- An 89.7% concordance rate was observed between Dt and CC.
- Discordant results (10.2%) included Dt-positive/CC-negative samples (78.3% with residual antibiotics) and Dt-negative/CC-positive samples (67.9% with Pseudomonas sp.).
Conclusions:
- The Dye test (Dt) demonstrates a high concordance with the classic colony-count (CC) method for uroculture analysis.
- The Dt method can help detect residual antibiotics and identify specific bacterial profiles in discordant samples, offering potential for improved diagnostic insights.