The human body has a core temperature that is critical to maintaining several physiological functions including metabolism, digestion, and muscle activity A change in the core temperature can result in severe health problems or indicate illness As a result, it is essential to measure the core body temperature accurately In this article, we discuss the different methods and techniques for measuring core body temperature.
1 Rectal temperature
The most accurate method of measuring the core body temperature is to measure the temperature in the rectum This technique can be used for both infants and adults A thermometer is inserted into the rectum, and the reading is taken The rectal temperature reflects the true core temperature because the rectum is located near the body’s core It is however not ideal for people in critical conditions such as premature infants, people with rectal abnormalities or those who have undergone rectal surgery.
2 Oral Temperature
Another commonly used method to measure core body temperature is through the mouth A thermometer is placed under the tongue for a few minutes to get the reading Oral temperature measurements, although convenient, are not as accurate as rectal measurements since the mouth temperature can be affected by external factors such as eating, drinking, or smoking The temperature can also be difficult to obtain accurately in people who have difficulty keeping their mouth closed.
3 Ear Temperature
An ear thermometer works by sensing the infrared radiation emitted from the ear canal and using it to calculate the temperature It is non-invasive and provides quick results However, the accuracy of the ear thermometer may be affected by factors such as earwax, and the technique used to insert the thermometer into the ear canal.
4 Skin Temperature
Skin temperature measurement is done by placing a thermometer on the skin surface The measurement is taken on the forehead, underarm, or abdomen how can the core body temperature be measured. Although a convenient option, skin temperature readings may not reflect the true core body temperature since the skin temperature is affected by external factors such as ambient temperature and sweating.
5 Temperature Capsules
Temperature capsules use a tiny temperature sensor that is swallowed They are small, ingestible probes that accurately measure the temperature in the gastrointestinal tract They provide continuous monitoring without the need for repeated insertion of a thermometer Upon swallowing, the capsule transmits temperature data to an external monitoring device, which can be read by the physician.
6 Temperature-sensitive filament
Temperature-sensitive filaments are thin strips of polyester, plastic, or other materials, that change color when heated They are applied to the skin surface and provide an indication of the skin temperature These filaments have a temperature range and can be accurate within a degree or so Although they do not accurately represent the core body temperature, they provide valuable information about the surface temperature, which is often necessary in clinical situations such as assessing body units’ temperature in neonatal settings.
7 Infrared Thermometers
Infrared thermometers use infrared radiation to detect and measure an object’s temperature without contact The forehead is a popular site for non-contact infrared thermometry The accuracy of infrared thermometers is variable and is affected by several factors that can cause error, including airflow, perspiration, and the presence of hair.
In conclusion, several different methods are available to measure core body temperature The accurate measurement of core body temperature is essential in many clinical contexts, including monitoring patients’ temperature, assessing fevers, detecting early signs of hypothermia, and preventing heatstroke Although oral and ear methods are widely used, rectal temperature is the most accurate, followed by ingesting a temperature capsule Clinicians must understand the strengths and shortcomings of each method and choose the most appropriate measurement method based on the clinical context and patient requirements