Fever helps the body fight off infections and may be one of the first signs of illness. Though fever signals the body's immune system is working to combat disease, fever can leave you feeling uncomfortable and lethargic. High fevers, above 107.6 degrees F can lead to brain damage. A child is considered to have a fever if her temperature measures above 100.4 degrees F. when measure rectally, or above 99.5 degrees F orally, according to the University of Maryland Medical Center. A glass thermometer can help you determine if your child has a fever.
Rectal Temperature
Step 1
Grasp the thermometer firmly in one hand. Shake the thermometer vigorously until the level of mercury falls below 98.6 degrees F.
Step 2
Lubricate the end of the thermometer with a little petroleum jelly. Have the child lay face down across your lap.
Step 3
Insert the tip of the thermometer in the child's rectum about 1 inch.
Step 4
Wait 2 minutes. Remove the thermometer and rotate it until you can read the mercury line.
Step 5
Clean the thermometer. Marshal University Medical Center recommends drawing the thermometer through a soapy cotton ball and rinsing in cool water.
Oral Temperature
Step 1
Hold the thermometer securely and shake it down until the level of mercury falls below 98.6 degrees F.
Step 2
Have the child open his mouth. Place the tip of the thermometer under the child's tongue on one side of the mouth. Ask the child to close his mouth, but not bite down.
Step 3
Wait 3 minutes. Remove the thermometer and rotate it until you can read the level of mercury.
Step 4
Clean the thermometer and store it in its case until next use.
Tips and Warnings
- Make sure the child hasn't eaten or had anything to drink for 30 minutes prior to having her temperature taken.
- Avoid using a single thermometer for both rectal and oral temperatures. Designate a single thermometer, clearly marked, for each measurement method.
Things You'll Need
- Petroleum jelly
- Soap and water
- Cotton ball
- Storage case
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