BAM Logo

Counting of aerobic mesophilic microorganisms in raw milk

[Recuento de microorganismos mesófilos aerobios en leche cruda]

EPTIS factsheet 521583 | Last revision 2023-07-25 | URL: https://www.eptis.bam.de/pts521583 https://www.eptis.bam.de/pts521583

PT provider
PT provider LACM/División de Metrología LACM/División de Metrología
Based in Chile
Language(s) Spanish
Remarks The PT objectives are: - To assess the performance of laboratories that perform aerobic mesophilic bacteria count determinations in raw milk by comparing their results with the robust consensus average of all participants and setting the best estimate of reproducibility that can be obtained from test published in the scientific literature, protocols, interlaboratory tests and results of the proficiency tests carried out by LACM® / Metrology Division in recent years. This goal is common for both the plate count method and the instrumental (Bactoscan). - This performance will be evaluated through the use of samples of predial milk, which allows the participating laboratories to evaluate their performance under the same conditions as the routine analysis. - The proficiency test is intended for the plate counting methods supported by widely used standards and the BactoScan instrumental method. - In the case of the instrumental method, the proficiency test allows to assess the performance in terms of the CFU/ml prediction that is achieved with the function that relates the instrumental counts with the plate counts. https://lacm-icytal.uach.cl/metrologia/ Accreditation number: PEA-ENS-14
Product groups Agriculture
Food and drink
Testing fields Microbiology
Technical details
Test item Tested property Testing method
Raw milk (cow) Counting of Colony Forming Units (CFU) of aerobic mesophilic microorganisms in CFU / ml ISO 4833-1:2013 (at 30°C by 72 h)
AOAC 986.33 (Petrifilm)
NCh 2045.Of1998 (at 32°C by 48 h)
FDA/BAM Online Chapter 3 (Aerobic Plate Count) at 32 °C
PRT-712.02-023 (ISPCH) (at 32°C by 48 h)
Aims of the PT scheme
Target group of participants Laboratories that performing microbiological analysis in Chile
Linked to specific legislation / standards ISO 13528:2022 ISO 22117:2019
Additional, subsidiary aims
Number of participants 8 to 12
Accredited or otherwise reviewed by a 3rd party

Accredited by Entidad Mexicana de Acreditación, EMA acreditación N°PEA-ENS-14 on the basis of ISO 17043:2010


Operation is commissioned / requested by No
Fees and frequency
Participation fee Please contact us for this information
Regularly operated Yes (Biannual)
Year of first operation 2007
Contact details of the PT provider
Provider Contact person
LACM/División de Metrología
Universidad Austral de Chile, Campus Isla Teja S/N, Valdivia, Chile

Phone: 56-63-2221247
Fax: 56-63-2221245
Mrs Susan Poo
Phone: 56-63-2221247
Fax: 56-63-2221245
Email: susan.poo@uach.cl susan.poo@uach.cl
If you find any mistakes please contact the responsible EPTIS coordinator in Chile, Mr. Manuel Navarrete Rossel. Mr. Manuel Navarrete Rossel.
Any questions or problems? Please contact us at eptis@bam.de.
Application version: 1.23-SNAPSHOT.20230502124635-7925ae379a631fc1ececff45d2921c8db38877d5