Axillary Temperature

The axillary temperature is so called because it is the temperature of the armpit, also known as the axilla. It is usually the lowest temperature when compared to oral, rectal and ear temperatures. The difference in the temperature reading is because the axillary temperature is taken outside the body and the air outside can affect the reading. The normal axillary temperature range is anywhere between 96.6°F and 98°F or 35.9°C to 36.7°C, and for fever it is above 99° F. It is mostly used to diagnose low-grade fevers or high body temperature and sometimes even low body temperature.

How to Measure the Temperature

• The thermometer is kept under the arm with its bulb in the center of the armpit
• Close the arm and keep the thermometer in between for at least 5 minutes.
• Now take out the thermometer and note the reading. Remember that axillary temperature will be about 1°F less than the oral temperature.
• Clean the tip before putting the thermometer away.

Temperature Conversion

While converting axillary temperature to oral temperature, add 0.5 to 1° F or 0.3 to 0.6° C to the axillary temperature reading. The difference between rectal and axillary temperatures is between 1-2° F or 0.6 to 0.12° C.

Axillary Vs. Oral Temperature

The difference between axillary and oral temperatures is between 0.5-1° F or 0.3 to 0.6° C. Taking an oral temperature is always more accurate. Since in this process, the thermometer is outside, the reading obtained from an axillary temperature will be less than that of the oral or real body temperature. The axillary temperature though, can be easy to measure as compared to an oral reading, especially in the case of little children.

Axillary Temperature for Babies

If the axillary temperature in a baby is very low, then it can be a problem. In a newborn or infant, this method is not recommended as the reading can vary quite a bit from the rectal temperature reading. A rectal temperature can be taken by placing the thermometer in the rectum of the baby. This reading is the most accurate indicator of body temperature.

The most accurate method for measuring the body temperature is by taking the rectal temperature. Though it is possible in babies and very young children, it might be uncomfortable in older children and adults. In such cases, it is best to measure the ear temperature, which gives a reading that is closest to the rectal temperature. The next best would be the oral temperature, as its readings are just about 0.5 to 1° F lower than the rectal temperature. While measuring the temperature, make sure that the patient hasn't just had a bath or has been exercising. This could give a wrong temperature reading. Improper placement of the thermometer or removing it too quickly, could also give a faulty thermometer reading. There are many types of thermometers available nowadays, each with its own specifications. While using electronic thermometers to take any temperature readings, make sure the battery is not weak or dead. When using a glass thermometer, (make sure the glass thermometer doesn't contain mercury, which is poisonous), be careful that it doesn't accidentally break while taking the axillary or oral temperatures, especially with children.