> 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/observable-entity/observable-entity-modeling/body-temperature.md).
# Body temperature
**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.**
*Core body temperature* is the temperature in the deep tissues and internal organs, including the brain. The gold standard site for measuring core body temperature is the pulmonary artery. Other sites for measuring core body temperature include the nasopharynx, esophagus, bladder, gastrointestinal tract, and vagina. Some peripheral sites are commonly used to estimate core body temperature but are not a true representation of core body temperature on their own, e.g., axillary region, inguinal region, sublingual space. *Body surface temperature* is measured at several sites, e.g., skin, foot, spine.
For example,
* 698831002 |Core body temperature measured in nasopharynx (observable entity)|
* 415882003 |Estimated core body temperature measured in axillary region (observable entity)|
* 364518005 |Temperature of foot (observable entity)|
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