This document provides guidance on measurement uncertainty and detection/quantification limits according to international standards. It discusses key concepts like types of uncertainty evaluation, propagation of uncertainty, and expanded uncertainty. It recommends following the ISO Guide to the Expression of Uncertainty in Measurement for terminology and methods. It also discusses definitions of minimum detectable concentration and minimum quantifiable concentration from IUPAC guidance. The document aims to unify approaches to uncertainty and detection/quantification limits and provide practical recommendations and examples.