A normal body temperature for infants aged 02 years ranges from 979100. Human body temperature varies depending on where on the body the temperature is taken and the time of measurement.
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Body temperature measurement who. Measuring body temperature is necessary to find and document abnormal temperature. Wait for 20 to 30 minutes after smoking eating or drinking a hot or cold liquid. There are many methods to measure body temperature. The average normal body temperature is 986f 37c. Infrared temperature sensors measure the bodies outer skin temperature but whether that is a good indication of internal body temperature is a medical question and beyond the scope of this blog. Measurement accuracy primarily depends on whether the thermometer is used correctly read the operating instructions.
This is known as wiens displacement law and has a theoretical explanation in plancks law and the bose. What most people think of a normal body temperature which is an oral temperature of 986f is an average of normal body temperatures in a large population of people. Measurement of the spectrum of electromagnetic radiation from an ideal three dimensional black body can provide an accurate temperature measurement because the frequency of maximum spectral radiance of black body radiation is directly proportional to the temperature of the black body. Ear temperature measurement may be acceptable for observing trends in body temperature but is less useful in consistently identifying and diagnosing fever. Wait at least 1 hour after heavy exercise or a hot bath before measuring body temperature. One factor which may influence the reading is ambient environment temperature.
Until recently direct measurement of core body temperature required either indigestible or surgical insertion of a probe. When you are too hot the blood vessels in your skin widen to carry the excess heat to your skins surface. The body is very good at keeping its temperature within a safe range even when temperatures outside the body change a lot. Body temperature is a measure of your bodys ability to make and get rid of heat. Sometimes babies and young children have higher body temperature ranges than adults for armpit and ear measurements. This is due to physiological factors and must be distinguished from thermometer malfunction.
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