The armpit (axillary) method is a common and convenient way to measure body temperature. Many people wonder about the accuracy of these readings and how to interpret them correctly. Understanding this technique helps in assessing body temperature and identifying potential health changes, making it a valuable and accessible home health tool.
Adjusting Armpit Temperature Readings
The practice of adding a degree to an armpit temperature reading is outdated and not recommended for modern digital thermometers. This idea originated from historical practices, as axillary temperatures often read lower than internal core body temperatures, like those measured orally or rectally. Older, less precise thermometers also contributed to this belief, as they might not have accurately captured the true surface temperature. However, current medical guidelines state that modern digital thermometers are designed to provide accurate readings without manual adjustment. Arbitrarily adding a degree can lead to an inaccurate assessment of health, potentially masking or exaggerating a fever.
Factors Affecting Armpit Temperature Accuracy
Armpit temperatures measure surface skin temperature, which is naturally lower than internal core body temperature because the armpit is an external site. Environmental and physiological factors can significantly influence these readings. For example, ambient room temperature, recent physical activity, sweating, or improper arm positioning can affect accuracy. Ensuring the armpit is fully closed and the thermometer is properly seated against the skin prevents air exposure from causing lower readings.
Ensuring Reliable Armpit Temperature Measurement
For consistent armpit temperature readings, use proper technique. First, ensure the armpit is dry, as moisture can affect accuracy. Place the tip of a clean digital thermometer directly into the center of the armpit. Bring the arm down snugly against the body to create a closed pocket, insulating the area and ensuring good contact. Hold the thermometer in place until it beeps, signaling the reading is complete.
Interpreting Armpit Temperature Readings
A normal armpit temperature range for adults typically falls between 95°F and 98.47°F (35.01°C to 36.93°C), though individual variations can occur. For infants up to age 5, an armpit temperature of 99°F (37.22°C) or higher is generally considered a fever. For older children and adults, an armpit temperature of 99°F (37.2°C) or higher can also indicate a fever. While a single armpit reading offers a snapshot, observing changes over time provides a more complete assessment. If a very high temperature is recorded, especially in infants, or if a fever persists or is accompanied by severe symptoms, it is advisable to consult a healthcare professional.