The Simple Guide to Taking Your Temperature Under the Armpit
When you're feeling under the weather, one of the first things you likely reach for is a thermometer. And for many of us, the go-to method involves tucking that little device snugly under an armpit. But have you ever stopped to wonder why we do it that way? Is it the most accurate method? What are the benefits and drawbacks of taking your temperature axillary (the fancy medical term for under the arm)? Let's dive into the details to answer these questions and more.
Understanding the Axillary Temperature Reading
The armpit, or axilla, is a common site for taking body temperature. It’s a relatively accessible and less intrusive location compared to other methods. However, it’s important to understand that the temperature reading obtained from the armpit is generally considered less accurate than those taken orally or rectally.
Here’s why:
- Surface Temperature: The armpit is an external body cavity. The temperature here is more influenced by the ambient air temperature and is less reflective of your core body temperature.
- Sweat and Moisture: Sweat can evaporate from the armpit, which can cool the area and lead to a lower reading.
- Less Direct Contact: The thermometer is not in direct contact with a major blood vessel or a warm internal cavity like the mouth or rectum.
Despite these limitations, taking your temperature under the arm is still a valid method, especially for certain individuals and situations.
When is the Armpit Method Recommended?
The axillary temperature reading is often preferred for:
- Infants and Young Children: It’s a safe and non-invasive way to check for fever in babies and toddlers who might not tolerate other methods well.
- Unconscious or Confused Individuals: For those who cannot hold a thermometer in their mouth, the armpit can be a viable option.
- Post-Oral Surgery or Oral Trauma: If someone has had recent dental work or an injury to the mouth, the armpit method avoids discomfort.
- General Screening: When a quick, general indication of a fever is needed, the armpit can be used.
How to Take an Accurate Armpit Temperature
To get the most reliable reading possible from under the arm, follow these steps:
- Ensure the Armpit is Dry: Gently pat the armpit dry with a clean cloth or tissue. Remove any excess moisture.
- Position the Thermometer Correctly: Place the tip of the thermometer in the center of the armpit, ensuring it touches the skin.
- Lower the Arm: Bring the arm down and hold it snugly against the body. This helps to create a closed space and trap body heat around the thermometer.
- Wait for the Reading: Digital thermometers will typically beep when they have finished. For older glass thermometers, you may need to leave it in place for 3-5 minutes.
- Read the Temperature: Carefully remove the thermometer and read the displayed temperature.
What is Considered a Fever When Taken Under the Armpit?
The normal body temperature can vary slightly, but for an armpit reading, a temperature of 97.6°F (36.4°C) to 98.6°F (37°C) is generally considered normal. A temperature of 99.6°F (37.6°C) or higher when taken under the arm is often considered a fever. However, it's crucial to remember that armpit temperatures are typically about 0.5°F to 1°F (0.3°C to 0.6°C) lower than oral temperatures. Therefore, if you get a reading that concerns you, it might be advisable to confirm it with another method, especially if the person has other symptoms of illness.
Comparing Armpit Temperature to Other Methods
It's helpful to understand how axillary readings compare to other common temperature-taking methods:
- Oral (Mouth): Generally considered more accurate than armpit readings. Normal oral temperature is around 98.6°F (37°C).
- Rectal: Considered the most accurate method, especially for infants, as it reflects core body temperature most closely. Normal rectal temperature is usually about 0.5°F to 1°F (0.3°C to 0.6°C) higher than oral.
- Tympanic (Ear): Can be accurate if used correctly, but earwax or incorrect placement can affect the reading.
- Temporal (Forehead): Convenient and quick, but can be influenced by sweat or direct sunlight.
When taking an axillary temperature, always remember that it's an indicator. If you suspect a fever or if the person has concerning symptoms, it’s always best to consult with a healthcare professional.
Frequently Asked Questions (FAQ)
How accurate is a thermometer reading from under the armpit?
An armpit temperature reading is generally considered less accurate than oral or rectal readings because it is influenced by external factors and is less reflective of core body temperature. However, with proper technique, it can still provide a useful indication of a fever.
Why is sweat a problem when taking an armpit temperature?
Sweat can evaporate, which has a cooling effect on the skin's surface. This evaporation can lead to a lower and less accurate thermometer reading from the armpit.
How long should I keep the thermometer under my armpit?
For digital thermometers, wait until the device beeps, which usually indicates the reading is complete (often within 30-60 seconds). For older glass thermometers, leave it in place for at least 3-5 minutes to ensure an accurate reading.
Can I use the same thermometer for oral and armpit readings?
It's best to have separate thermometers for oral and axillary (armpit) use, especially if using older mercury thermometers. However, most modern digital thermometers can be used for both, provided they are thoroughly cleaned and disinfected between uses, especially if one reading is for oral and the other is for axillary. Some healthcare professionals recommend dedicating one for oral use and another for axillary/rectal use to avoid cross-contamination or reading inaccuracies.
