Body temperature is the measurement of the degree of heat present in the human body. It is a vital sign that aids clinicians in diagnosing various medical conditions such as fever, hypothermia, and hyperthermia. Normally, the body temperature falls within the range of 36.1°C to 37.2°C (97°F to 99°F). To maintain stable health and body functions, maintaining a constant body temperature within the normal range is crucial.
Measurement of body temperature can be done through different techniques, varying in their accuracy, cost, and convenience. The core body temperature, which is the temperature of the inner body, is more accurate than surface temperature measurements. In this article, we will discuss the techniques used to measure core body temperature.
how can the core body temperature be measured
Rectal Temperature
The rectal temperature measurement is the most accurate technique used to measure the core body temperature. It involves inserting a rectal thermometer into the anus and waiting for it to display the temperature. This technique of measuring the core body temperature is commonly used in infants, critically ill patients, and people who cannot measure the temperature through other methods accurately.
However, the rectal temperature measurement can be uncomfortable, and there is a risk of injury during insertion. It can also cause infections, and it is not suitable for people with hepatic or hematological diseases.
Oral Temperature
Oral temperature measurement involves inserting a thermometer under the tongue and closing the mouth. It is the most commonly used technique for adults and children who can understand and obey instructions. The thermometer should be held in place for two to three minutes before the reading can be taken.
Oral temperature measurement is cost-effective and readily available. However, it is not suitable for people with respiratory illnesses or who are unconscious, as it may cause breathing difficulties.
Axillary Temperature
Axillary temperature measurement involves placing a thermometer under the armpit and holding it in place until the reading is taken. This technique is non-invasive and easy to perform. It is commonly used in infants, children, and adults who cannot tolerate other methods of temperature measurement.
However, the accuracy of axillary temperature measurement is limited and may result in lower readings than rectal or oral measurements. It is also affected by environmental factors such as clothing, which can alter the results.
Ear Temperature
Ear temperature measurement is done using a special thermometer that is placed in the ear canal. It is non-invasive and easy to use. The thermometer uses infrared technology to detect the temperature of the eardrum accurately.
Ear temperature measurement is recommended for children over six months of age and adults. It is not recommended for people with ear infections, earwax buildup, or who have recently gone swimming.
Temporal Artery Temperature
Temporal artery temperature measurement is a non-invasive technique that involves placing a thermometer on the forehead and running it along the side of the head to the temple. It uses infrared technology to read the temperature of the temporal artery.
Temporal artery temperature measurement is safe, fast, and easily performed. It is recommended for people of all ages, especially infants and young children. However, environmental factors such as sweating or wearing a hat may affect the results.
Esophageal Temperature
Esophageal temperature measurement involves inserting a probe into the esophagus to measure the core body temperature. It is the most accurate temperature measurement method, and it is commonly used in critical care settings.
Esophageal temperature measurement is highly invasive and requires specialized equipment and trained personnel to perform. The procedure also carries the risk of complications such as perforation or infection.
In conclusion, measuring the core body temperature is vital to maintain good health and to diagnose various medical conditions accurately. The techniques used to measure the core body temperature vary in accuracy, cost, and convenience. The most commonly used methods are oral, rectal, and axillary temperatures. Other methods such as ear, temporal artery, and esophageal temperatures are also available but not widely used.
Therefore, it is essential to select the appropriate temperature measurement technique based on the patient’s age, medical history, and the nature of the illness. The patient’s comfort, safety, and accurate temperature measurement should be prioritized while choosing the temperature measurement method. In case of any doubts or concerns, it is advisable to consult a healthcare professional.