How to Use a Digital Thermometer

A digital thermometer offers the quickest, most accurate way to take a child’s temperature and can be used in the mouth, armpit, or rectum. Before you use one, read the directions thoroughly. You need to know how the thermometer signals that the reading is complete (usually, it’s a beep or a series of beeps or the temperature flashes in the digital window on the front of the thermometer).
First, turn on the thermometer and make sure the screen is clear of any old readings. If your thermometer uses disposable plastic sleeves or covers, put one on according to the manufacturer’s instructions. Remember to discard the sleeve after each use and to clean the thermometer according to the manufacturer’s instructions before putting it back in its case.
To take a rectal temperature: Before becoming parents, most people cringe at the thought of taking a rectal temperature. But don’t worry — it’s a simple process:
Lubricate the tip of the thermometer with a lubricant, such as petroleum jelly.
Place your child:
- belly-down across your lap or on a firm, flat surface and keep your palm along the lower back
- or face-up with legs bent toward the chest with your hand against the back of the thighs
With your other hand, insert the lubricated thermometer into the anal opening about ½ inch to 1 inch (about 1.25 to 2.5 centimeters). Stop if you feel any resistance.
Steady the thermometer between your second and third fingers as you cup your hand against your baby’s bottom. Soothe your child and speak quietly as you hold the thermometer in place.
Wait until you hear the appropriate number of beeps or other signal that the temperature is ready to be read. Write down the number on the screen, noting the time of day that you took the reading.
To take an oral temperature: This process is easy in an older, cooperative child.
Wait 20 to 30 minutes after your child finishes eating or drinking to take an oral temperature, and make sure there’s no gum or candy in your child’s mouth.
Place the tip of the thermometer under the tongue and ask your child to close his or her lips around it. Remind your child not to bite down or talk, and to relax and breathe normally through the nose.
Wait until you hear the appropriate number of beeps or other signal that the temperature is ready to be read. Write down the number on the screen, noting the time of day that you took the reading.
To take an axillary temperature: This is a convenient way to take a child’s temperature. Although not as accurate as a rectal or oral temperature in a cooperative child, some parents may prefer to take an axillary temperature, especially for kids who can’t hold a thermometer in their mouths.
Remove your child’s shirt and undershirt, and place the thermometer under an armpit (it must be touching skin only, not clothing).
Fold your child’s arm across the chest to hold the thermometer in place.
Wait until you hear the appropriate number of beeps or other signal that the temperature is ready to be read. Write down the number on the screen, noting the time of day that you took the reading.
Whatever method you choose, keep these additional tips in mind:
Never take a child’s temperature right after a bath or if he or she has been bundled tightly for a while — this can affect the temperature reading.
Never leave a child unattended while taking a temperature.