To get an accurate measurement of a person's temperature, a thermometer is required. There are a several types of thermometers, which are used on different parts of the body:

 - On the forehead by the temporal artery
 - In the ear
 - In the mouth
 - Under the arm
 - In the rectum

Ensure that the thermometer is clean and is being used at its intended site.

In situations without a thermometer, there are a handful of rough ways to assess the presence of a fever, a common immune system response to ward off colds. Fevers cause increased muscle contractions, chills, and the feeling of being cold even when that does not make sense (such as while under lots of blankets). Normal fevers are part of the immune system's response along with fatigue and a lack of hunger, and are nothing to worry about on their own, so long as the patient's temperature stays below 40.0 °C (104.0 °F).
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