There are a few varieties of thermometers available to measure body temperature. In the past, most people used an oral or rectal thermometer. More recently, infrared ear thermometers have been used in medical facilities and are available for home use.
An ear thermometer works by measuring the heat released from the eardrum in the inner ear. The heat that is emitted from the eardrum is measured by an infrared detector on the ear thermometer and a digital reading is given. Almost all ear thermometers use infrared detectors.
Body temperature is most accurately measured when taken recessed in the body. This is why taking a temperature under the tongue or in the rectum works well. The eardrum is considered a good location because it is located deep in the head.
Most ear thermometers have a short tube connected to the rest of the device. The tube is placed in the ear canal and a button is pressed. The infrared sensor detects the heat inside the ear in a matter of seconds. The temperature reading is displayed on a digital display on the ear thermometer.
Ear thermometers work best for babies over one year of age. Very young babies have small ear canals and it can be more difficult to achieve correct alignment in the canal. Most babies, older than one year, will have ear canals large enough for the ear thermometer to work effectively.
Studies on the accuracy of the ear thermometer vary. Most manufacturers claim they are accurate to within 0.5 degrees when used correctly. Proper alignment in the ear canal is essential for more accurate results. Manufacturers recommend pulling outward, slightly above the earlobe, while placing the thermometer. This will lengthen and straighten the ear canal and help with proper alignment.
There are some things that can get in the way of an accurate reading. The ears should be clean when using the thermometer, as a build-up of ear wax can contribute to an inaccurate reading. Cold air outside can also make it difficult to read infrared heat from the eardrum. It is suggested to wait 15 minutes after being outside in the cold.
Caution should also be exercised when using the ear thermometer. The eardrum is delicate and pushing the thermometer too far into the ear can cause damage. However, not placing the device far enough into the ear can prevent an accurate temperature from being detected.
Most pharmacies, department stores, and medical supply stores will carry a variety of ear thermometers. They can also be purchased online. The cost varies. However, most of those intended for home use are priced at around $ 50 US dollars (USD).