ASTM International - ASTM E1326-15

Standard Guide for Evaluating Non-culture Microbiological Tests Used for Enumerating Bacteria

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Organization: ASTM International
Publication Date: 1 May 2015
Status: historical
Page Count: 5
ICS Code (Medical microbiology): 07.100.10
significance And Use:

5.1 This guide should be used by producers and potential producers of non-culture tests to determine the accuracy, selectivity, specificity, and reproducibility of the tests, as defined in... View More

scope:

1.1 The purpose of this guide is to assist users and producers of non-culture tests in determining the applicability of the test for processing different types of samples and evaluating the accuracy of the results. Culture test procedures such as the Heterotrophic (Standard) Plate Count, the Most Probable Number (MPN) method and the Spread Plate Count are widely cited and accepted for the enumeration of microorganisms. However, these methods have their limitations, such as performance time and degree of accuracy. Moreover any given culture test method typically recovers only a fraction of the total viable microbes present in a sample. It is these limitations that have recently led to the marketing of a variety of non-culture procedures, test kits and instruments.

1.2 Culture test methods estimate microbial population densities based on the ability of mircoorganisms in a sample to proliferate in or on a specified growth medium, under specified growth conditions. Non-culture test methods attempt to provide the same or complimentary information through the measurement of a different parameter. This guide is designed to assist investigators in assessing the accuracy and precision of non-culture methods intended for the determination of microbial population densities or activities.

1.3 It is recognized that the Heterotrophic Plate Count (HPC) does not recover all microorganisms present in a product or a system (1, 2).2 When this problem occurs during the characterization of a microbiological population, alternative standard enumeration procedures may be necessary, as in the case of sulfate-reducing bacteria. At other times, chemical methods that measure the rates of appearance of metabolic derivatives, the utilization of contaminated product components or genetic profile of the microbial population might be indicated. In evaluating non-culture tests, it is possible that the use of these alternative standard procedures might be the only means available for establishing correlation. In such cases, this guide can serve as a reference for those considerations.

1.4 Because there are so many types of tests that could be considered non-culture based, it is impossible to recommend a specific test protocol with statistical analyses for evaluating the tests. Instead, this guide should assist in determining what types of tests should be considered to verify the utility and identify the limitations of the nonconventional test.

1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

Document History

December 1, 2020
Standard Guide for Evaluating Non-culture Microbiological Tests
1.1 The purpose of this guide is to assist users and producers of non-culture microbiological tests in determining the applicability of the test for processing different types of samples and...
October 1, 2015
Standard Guide for Evaluating Non-culture Microbiological Tests
1.1 The purpose of this guide is to assist users and producers of non-culture microbiological tests in determining the applicability of the test for processing different types of samples and...
ASTM E1326-15
May 1, 2015
Standard Guide for Evaluating Non-culture Microbiological Tests Used for Enumerating Bacteria
1.1 The purpose of this guide is to assist users and producers of non-culture tests in determining the applicability of the test for processing different types of samples and evaluating the accuracy...
October 1, 2013
Standard Guide for Evaluating Nonconventional Microbiological Tests Used for Enumerating Bacteria
5.1 This guide should be used by producers and potential producers of nonconventional tests to determine the accuracy, selectivity, specificity, and reproducibility of the tests, as defined in...
October 1, 2008
Standard Guide for Evaluating Nonconventional Microbiological Tests Used for Enumerating Bacteria
1.1 The purpose of this guide is to assist users and producers of nonconventional tests in determining the applicability of the test for processing different types of samples and evaluating the...
November 1, 2006
Standard Guide for Evaluating Nonconventional Microbiological Tests Used for Enumerating Bacteria
1.1 The purpose of this guide is to assist users and producers of nonconventional tests in determining the applicability of the test for processing different types of samples and evaluating the...
October 10, 1998
Standard Guide for Evaluating Nonconventional Microbiological Tests Used for Enumerating Bacteria
1.1 The purpose of this guide is to assist users and producers of nonconventional tests in determining the applicability of the test for processing different types of samples and evaluating the...
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