Measuring body temperature accurately is essential for monitoring health and identifying potential issues.

Whether using a mercury, digital, or infrared thermometer, following the correct methods is crucial for reliable results.

Here are the key techniques to master when measuring body temperature.

1. Choose the Right Thermometer

Selecting the correct thermometer depends on the situation and the individual's age:

Mercury Thermometers: Highly accurate but fragile and require careful handling due to the toxic mercury content.

Digital Thermometers: Fast, easy to use, or underarm measurements.

Infrared Thermometers: Ideal for non-contact readings, especially for infants or during infectious outbreaks, as they measure temperature from the forehead or ear.

Choosing the appropriate device is the first step toward precise temperature readings.

2. Prepare for Measurement

Preparation is essential for accurate readings:

Wash your hands thoroughly before handling the thermometer.

Clean the thermometer with alcohol or disinfectant to prevent cross-contamination.

Shake mercury thermometers to below 35°C (95°F) before use.

Check the battery on digital thermometers to ensure they work properly.

Proper preparation ensures both hygiene and accuracy.

3. Place the Thermometer Correctly

Correct placement varies by thermometer type:

Place the thermometer under the tongue and ask the individual to close their lips. Avoid eating or drinking anything hot or cold 15 minutes before measurement to prevent skewed results.

Axillary (Armpit) Measurement: Place the thermometer under the armpit and ensure the arm stays close to the body. While less precise, this method is suitable for quick screenings.

Forehead or Ear Measurement: Infrared thermometers must be positioned at the correct distance from the forehead or securely in the ear for accurate readings.

4. Follow Timing Guidelines

Each thermometer type has a recommended duration:

Mercury thermometers require 3–5 minutes.

Digital thermometers beep when ready, usually within a minute.

Infrared thermometers provide instant readings.

Avoid rushing to ensure accuracy.

5. Read and Record Results

After measurement:

Read the temperature carefully. For mercury thermometers, hold them at eye level to see the scale clearly.

Record the reading and repeat if results seem unusual or inconsistent.

6. Ensure Proper Aftercare

Once the temperature is recorded:

Clean the thermometer with alcohol or disinfectant wipes.

Store it in a dry, safe location to maintain its accuracy.

7. Additional Tips for Accurate Readings

Take measurements at the same time daily, as body temperature naturally fluctuates.

If using an infrared thermometer, ensure the forehead or ear is clean and free of sweat or debris.

Measuring body temperature is straightforward with the correct methods. Choosing the right thermometer, preparing and placing it properly, following timing guidelines, and interpreting results with care ensures reliable measurements.

Mastering these techniques supports effective health monitoring, enabling timely identification of health concerns.