I attended a Workshop last year - Uncertainty from sampling and analysis for accredited laboratories.
I presented a PowerPoint about an approach of Uncertainty in sampling for microbiology analysis. In XYZ, our Accreditation Body still wants the presentation of sampling and analysis uncertainty or the measurement uncertainty in the report. The problem is that we do not have a standard or a guide to calculate it as we saw on the presentation of the ILAC.
Do you know any document that has been published since then?
I would say that until the ILAC decision is communicated after the March 2020 Beijing meeting, there is justification to merely interpret and comply with the ISO 17025:2017 requirements for measurement uncertainty evaluation (as discussed in the ILAC presentation). Besides the latest Eurachem guideline Measurement uncertainty arising from sampling, 2nd edition (2019), available at https://www.eurachem.org/index.php/publications/guides/musamp; the primary normative ISO standards are the ISO 98 series, including
ISO/IEC GUIDE 98-1:2009 [JCGM/WG1/104] Uncertainty of measurement - Part 1: Introduction to the expression of uncertainty in measurement;
ISO/IEC Guide 98-3:2008(en) Uncertainty of measurement - Part 3: Guide to the expression of uncertainty in measurement (GUM:1995);
ISO/IEC Guide 98-4:2012 Uncertainty Of Measurement - Part 4: Role Of Measurement Uncertainty In Conformity Assessment
Then for Microbiology, there is the recently revised ISO 19036:2019 Microbiology of the food chain - Estimation of measurement uncertainty for quantitative determinations. Trust this is of some assistance.