To check for fever using a digital thermometer, follow these steps:
- Turn on the digital thermometer by pressing the power or reset button until it is ready to use
- Choose the measurement site :
- Oral (under the tongue): Place the tip of the thermometer under the tongue, close the mouth, and breathe through the nose. Keep the thermometer in place until it beeps, usually within one minute
* **Rectal** (for infants or young children, most accurate): Apply petroleum jelly on the tip, insert it gently about 1/2 to 1 inch into the rectum, hold steady until it beeps
* **Axillary** (under the armpit, less accurate): Place the thermometer under the armpit, press the arm against the body, and wait for the beep
* **Ear or forehead thermometers** are alternatives but may differ slightly in accuracy
- Read the temperature displayed on the digital screen after the beep indicates the measurement is complete
- Clean the thermometer after use with antiseptic, rubbing alcohol, or soapy water to maintain hygiene
- Avoid measuring immediately after eating, drinking hot or cold liquids, exercising, or bathing , as these can affect accuracy. Wait 20-30 minutes before taking the temperature
Normal body temperature is about 98.6°F (37°C), with fever generally considered at or above 100.4°F (38°C) orally. Rectal temperatures tend to be slightly higher, and armpit temperatures slightly lower, than oral readings
. This method provides a reliable way to detect fever at home using a digital thermometer
