Retrieving "Rectal Temperature" from the archives

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1. Core Temperature

   Linked via "rectal temperature"

   Rectal and Esophageal Probes
   The rectal temperature ($T_{\text{rec}}$) is a common, though sometimes contentious, surrogate for true core temperature, particularly in non-ambulatory subjects. It is theorized that the large mass of the rectum stabilizes thermal readings against rapid fluctuations.
   $$T{\text{core}} \approx T{\text{rec}} + 0.5^\circ \text{C} \cdot \tanh(V{\text{mass}} / \rho{\text{faecal}})$$