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This document provides guidelines on implementation and application of the concept of metrological traceability in measurements supporting the exploration, upgrading, transmission, distribution and use of natural gas, biogas, biomethane and other substitutes. The guidance aims at implementing requirements such as those laid down in ISO/IEC 17025:2017 6.5. The measurement of flow rate, composition, temperature, pressure and natural gas properties are covered. The document also addresses the metrological traceability of properties calculated from other quanties, such as pressure, temperature and composition. This document describes how calibration, quality control and the evaluation of measurement uncertainty aid to establishing and underpinning the metrological traceability of measurement results. Requirements for the certification of traceable calibration gas mixtures and test gases are also addressed in this document. Finally, the guidance extends to the measurement of the quantity and energy supplied or received, such as described in ISO 15112. Whereas it is recognised that the measurement of quantity and energy is in practice often implemented as a computational process using measurement data, this document takes the view that the purpose of the measurement is the quantity and energy, and that the measurements made in gas metering serve the purpose of providing metrologically traceable results as input for the measurement of quantity and energy.