Whichever type of thermometer you choose, be sure you know how to use it correctly to get an accurate reading. Keep and follow the manufacturer's recommendations for any thermometer.
Digital thermometers usually provide the quickest, most accurate readings. They come in many sizes and shapes, are available at most supermarkets and pharmacies, and are available in a range of prices. Although you should read the manufacturer's instructions to determine what method or methods the thermometer is designed for, many digital thermometers can be used for the following temperature-taking methods:
Digital thermometers usually have a plastic, flexible probe with a temperature sensor at the tip and an easy-to-read digital display on the opposite end.
How Do I Use a Digital Thermometer?
Electronic ear thermometers measure the tympanic temperature - the temperature inside the ear canal. Although they're quick, accurate, and easy to use in older children, electronic ear thermometers aren't as accurate for very young children as digital thermometers and are more expensive. The American Academy of Pediatrics (AAP) advises against using electronic ear thermometers for infants younger than 3 months.
Plastic strip thermometers (small plastic strips that you press against your child's forehead) may be able to tell you whether your child has a fever, but they aren't reliable for taking an exact measurement, especially in infants and children. If you need to know your child's exact temperature, plastic strip thermometers are not the way to go.
Forehead thermometers may be a reasonable alternative to ear thermometers, if your infant is younger than a year old. But they are not as accurate as oral or rectal digital thermometers.
Pacifier thermometers may seem convenient, but again, they're unreliable and shouldn't be used in infants younger than 3 months. They also require the child to keep the pacifier in the mouth for several minutes without moving, which is a nearly impossible task for most babies and toddlers.
Glass mercury thermometers were once commonly used, but the AAP now advises against using them because of concerns about possible exposure to mercury, which is an environmental toxin. (If you still have a mercury thermometer, do not simply throw it in the trash where the mercury can leak out. Talk to your child's doctor or your local health department about how and where to dispose of your mercury thermometer.)
As any parent knows, taking a squirming child's temperature can be challenging. But it's one of the most important tools doctors have to figure out if your child has an illness or infection. The method you choose to take your child's temperature will depend on his or her age and how cooperative your child is.
If your child is younger than 3 months, you'll get the most reliable reading by using a digital thermometer to take a rectal temperature. Electronic ear thermometers aren't recommended for infants younger than 3 months because their ear canals are usually too small.
If your child is between 3 months to 4 years old, you can use a digital thermometer to take a rectal temperature or an electronic ear thermometer to take the temperature inside the ear canal. You could also use a digital thermometer to take an axillary temperature, although this is a less accurate method.
If your child is 4 years or older, you can usually use a digital thermometer to take an oral temperature if your child will cooperate. However, children who have frequent coughs or are breathing through their mouths because of stuffy noses might not be able to keep their mouths closed long enough for an accurate oral reading. In these cases, you can use the tympanic method (with an electronic ear thermometer) or axillary method (with a digital thermometer).