This publication provides detailed information for assessing the essential quality requirements for performing microbiological and chemical analyses of food, dietary supplements, and pharmaceuticals.

The AOAC INTERNATIONAL Guidelines for Laboratories Performing Microbiological and Chemical Analyses of Food, Dietary Supplements, and Pharmaceuticals, An Aid to Interpretation of ISO/IEC 17025:2017 was created by the Analytical Laboratory Accreditation Criteria Committee (ALACC) to provide a section-by-section interpretation of requirements.

ALACC is a multinational group of experts from varied scientific disciplines and industries, and part of AOAC’s Technical Division for Laboratory Management (TDLM). 

Available Formats


(ISBN 0-935584-86-2), Item 11545, is a softbound book, available for $188 per copy plus shipping.


A searchable PDF version, available through individual use and organizational licenses. [below to be formatted as a table when pricing is confirmed] 

Individual Use LicenseItem 11545Member Rate: $188Non-Member Rate: $209
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ALACC Frequently Asked Questions 

Question 1 – Expired CRMs

Section 6.4.4. of the Guidelines states that reagents, reagent solutions, sample solutions, and internal reference materials – including certified reference materials (CRMs) used as internal reference materials – shall not be used past their expiration date without recorded verification that they are still suitable for use. Media and CRMs cannot be used beyond their expiration date. Note: Expired CRMs can be qualified as Reference Materials (RMS).  The question is: when can an expired CRM be used?

Answer: A CRM is an RM characterized by a metrologically valid procedure for one or more specified properties, accompanied by a reference material certificate that provides: 1) the value of the specified property, 2) its associated uncertainty, and 3) a statement of metrological traceability.  When A CRM expires it loses a link to its uncertainty and traceability but still may be sufficiently homogeneous and stable with respect to one or more of its specified properties.  Thus, a CRM that has passed its expiration date can still be used as a QC or as an RM if it is used in a manner that does not require the application of these two lost attributes as long as it is evaluated and re-qualified for suitability.

Reference: ISO Guide 80:2014 , Guidance for the in-house preparation of quality control materials (QCMs)

Question 2 – Internal audits         

Section 8.8.1. of the Guidelines states that internal audits of laboratory information management systems shall be conducted at least once per accreditation cycle. Question:  What information is required to satisfy this requirement?

Answer:  The laboratory is required to audit the acquisition, transfer and data storage process in the LIMS, along with permissions for access to the various data to ensure only authorized personnel can access the different parts of the LIMS.

Question 3 – Appendix A: Equipment   

Question: In the 2018 AOAC Guidelines and if there can be an acceptable alternative to measuring the mass of water as a means of verifying the accuracy of volumetric delivery devices: mechanical pipets, mechanical burets and liquid dispensers: 

Specifically  this concerns bottle top dispensers.  “We verify our bottle top dispensers by dispensing the liquid needing measured (usually an acid) into a class A cylinder on the day of use.  If the volume is accurate, the measurement is documented and the dispenser is then used freely until the volume is changed or until next day of use. The question is, can this volume check method be considered an acceptable alternative to weighing on a balance as we are not wanting to put water through our acid dispensers?  

Answer:  An acceptable alternative to weighing the mass of liquid delivered by a bottle top dispenser would be through measuring the dispensed volume of liquid. It is up to the lab to ensure the alternative to weighing is suitable for its intended use.

Question 4 – Appendix C: Chemistry

Question: Is it acceptable to place information about a method, such as acceptance criteria for quality control materials, in the LIMS?

Answer: Yes.

Question 5 – Table 1: Balances

The requirement states that a calibration is required when a balance is “moved to a different location or after repair”.  However this has created some confusion as to whether there is a certain magnitude of the move or repair, that if exceeded would trigger the need for a calibration.

Answer: A calibration is required when there has been a  significant move (one involving packing and transport) to a different location or after a repair that requires significant disassembly and that produces a significant risk to the accuracy of measurements.  A move to another lab bench or a minor repair would not necessarily trigger the need for a calibration.