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Core temperature, also called core body temperature, is the operating temperature of an Organism, specifically in deep structures of the body such as the Liver, in comparison to temperatures of peripheral tissues. Core temperature is normally maintained within a narrow range so that essential enzymatic reactions can occur. Significant core temperature elevation (Hyperthermia) or depression (Hypothermia) over more than a brief period of time is incompatible with Human life. Temperature examination in the Heart, using a catheter, is the traditional gold standard measurement used to estimate core temperature (oral temperature is affected by hot or cold drinks, ambient temperature fluctuations as well as mouth-breathing). Since catheters are highly invasive, the generally accepted alternative for measuring core body temperature is through measurements in the Rectum. [from Wikipedia]
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