Digital thermometers work by using heat sensors that determine body temperature.
They can be used to take temperature readings in the mouth, rectum, or armpit.
When assessing digital thermometer readings, keep in mind that armpit (axillary) temperature runs about ½ to 1°F (0.6°C) cooler than oral readings. Rectal thermometers run ½ to 1°F (0.6°C) warmer than oral readings.
Benefits
Digital thermometers provide accurate readings in about 1 minute or less.
Drawbacks
In order to get an accurate reading from oral use, the tip of the device must be placed under the tongue with the mouth completely closed. For this reason, rectal readings are considered to be the most accurate for infants and small children. Additionally:
Oral readings won’t be accurate if they are taken too close to eating or drinking, because results may be skewed by your food or drink’s temperature. Wait at least 15 minutes.
Rectal readings may be uncomfortable to get for infants and small children.
You shouldn’t use the same thermometer for both rectal and oral readings. This may require the purchase of two thermometers, which should be labeled.
Batteries in thermometers should be replaced periodically. Make sure you have the right type of batteries on hand for your device and that you understand how to change them, so you’re not left scrambling in an emergency.
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