Measure body temperature by placing a digital or manual thermometer under the tip of the tongue, in the ear canal or in the anal opening, states About.com. For the most accurate results, wait at least 10 minutes after eating or drinking before taking an oral temperature.Continue Reading
When taking an oral temperature with a manual thermometer, wait three minutes, then remove the device and read the temperature indicated on the side, states Drugs.com. Digital thermometers display the temperature in a window and beep when they are ready to be read.
Apply lubrication before using a rectal thermometer, states About.com. Before using a manual thermometer, shake until the mercury level is below 96 degrees Fahrenheit.Learn more about Diagnostics & Imaging