Skip to product information
1 of 1

ISO 14461-2 | IDF 169-2: 2005 - Quality control in microbiological laboratories - Part 2: Determination of the reliability of colony counts of parallel plates and subsequent dilution steps

Regular price €83,00+ taxes as applicable
Regular price Sale price €83,00
Sale Sold out
Language
Type

Document info

pages 18
published date 24 March 2005
reference ISO 14461-2, IDF 169-2:2005

Publication description

This standard describes a routine procedure for the evaluation of results of the enumeration of microorganisms using colony-count methods with subsequent 10-fold dilution steps and one plate or two parallel plates within each dilution step.

This routine procedure is applied regularly in each laboratory performing colony counts. It provides criteria for the acceptability of differences between the results from parallel plates and subsequent dilution steps, as follows.

The results (colony counts) obtained from parallel plates are compared with tabulated limits for given colony counts. If these limits are exceeded, a technical problem when performing the parallel determinations may be indicated.

The results (sums of colony counts) of two parallel plates of two subsequent 10-fold dilution steps are compared with tabulated limits for given sums of colony counts. If these limits are exceeded, a technical problem when performing the dilutions may be indicated.

If the limits mentioned above are exceeded in more cases than expected, this indicates that the test procedure lacks reliability.

Standard only available in English.

Stay up to date with all the latest IDF publications with one of our yearly packages

Save now