Normal body temperature varies by a person’s age, activity, and the time of day at which it is being measured. Fahrenheit, Kelvin, and Celsius are three temperature measurement units used to measure patient body temperature. The normal average body temperature in humans is considered to be 98.6 degree Fahrenheit. Body temperature represents the balance between heat production and heat loss. Persons whose body temperature rises to 100.4 degrees Fahrenheit are considered ill.
Temperature measurement through thermometers helps in the diagnosis of illness in humans. Thermometer is a temperature measurement instrument sealed in a glass tube. Electronic thermometers are now commonly used as temperature measurement devices. Patient warming and cooling are important factors to be considered in patient temperature management. Normal body temperature can be affected by intrinsic and extrinsic (environmental) factors. Sites such as oral cavity, axilla, temporal artery, external auditory canal, and rectum are suitable for noninvasive estimation of actual body temperature.
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