> For the complete documentation index, see [llms.txt](https://docs.snomed.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.snomed.org/education/snomed-ct-education-editorial-guide/readme/authoring/domain-specific-modeling/qualifier-value/international-system-of-units-unit-of-mass.md).

# International System of Units - unit of mass

<mark style="color:$danger;">**This Editorial Guide is used for Education Purposes Only. It is used in the Authoring Courses and Certifications. It is based on the January 2026 Editorial Guide.**</mark>

The 258681007 | International System of Units unit of mass (qualifier value) | hierarchy contains concepts representing metric units of mass.

**Concepts representing Unit of Mass**

<table><thead><tr><th width="116.17010498046875"></th><th></th></tr></thead><tbody><tr><td><strong>FSN</strong></td><td><strong>X</strong> metric unit of mass</td></tr><tr><td><strong>PT</strong></td><td><p><strong>X</strong> metric unit of mass abbreviated without the expanded form</p><ul><li>This is an exception to the SNOMED CT standard of requiring abbreviations to be accompanied by the expanded term or phrase.</li></ul></td></tr><tr><td><strong>SYN</strong></td><td><strong>X</strong> metric unit of mass</td></tr></tbody></table>

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