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Central temperatures, such as rectal temperatures, are more accurate than peripheral temperatures. [30] Fever is generally agreed to be present if the elevated temperature [31] is caused by a raised set point and: Temperature in the anus (rectum/rectal) is at or over 37.5–38.3 °C (99.5–100.9 °F).
An early morning temperature higher than 37.3 °C (99.1 °F) or a late afternoon temperature higher than 37.7 °C (99.9 °F) is normally considered a fever, assuming that the temperature is elevated due to a change in the hypothalamus's setpoint. [15] Lower thresholds are sometimes appropriate for elderly people. [15]
Hyperthermia is generally diagnosed by the combination of unexpectedly high body temperature and a history that supports hyperthermia instead of a fever. [2] Most commonly this means that the elevated temperature has occurred in a hot, humid environment (heat stroke) or in someone taking a drug for which hyperthermia is a known side effect ...
A medical/clinical thermometer showing the temperature of 38.7 °C (101.7 °F) ... Fahrenheit's scale is still in use, alongside the Celsius and Kelvin scales.