AccuMed AT2103 Handmatig - Pagina 5

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THE DIFFERENT METHODS OF TEMPERATURE MEASUREMENT

Core temperature

Core temperature is the most precise measurement and involves measuring the temperature in

the pulmonary artery by means of a catheter equipped with a thermal probe which can read the

temperature in place. The same method is employed for probes measuring the esophageal

temperature. However, such invasive temperature measurement methods require specific

equipment and expertise.

Rectal thermometry

Rectal temperature adjusts slowly in comparison to the evolution of the body's internal

temperature. It has been demonstrated that rectal temperature remains raised long after the

internal temperature of the patient has started to drop and vice versa. Furthermore, rectal

perforations have been known to occur as a result of this method and without appropriate

sterilization techniques, rectal thermometry can spread germs often found in feces.

Oral thermometry

Oral temperature is easily influenced by recent ingestion of food or drinks and by breathing

through the mouth. To measure oral temperature, the mouth must remain closed and the tongue

lowered for three to four minutes which is a difficult task for young children to accomplish.

Axillary (armpit) temperature

Although it may be easy to measure axillary temperature, it has been proven that it does not

provide an accurate measurement of the child's internal temperature. To take this type of

temperature, the thermometer must be wedged tightly over the axillary artery. Despite the low

sensitivity and relative inaccuracy of axillary temperature in detecting fever, this method is

recommended by The American Academy of Pediatrics as a screening test for fever in newborns.

Tympanic thermometry

In order to obtain a precise temperature reading, good command of the measurement technique

is required. The thermometer probe must be placed as close as possible to the warmest part of

the external ear canal. An incorrectly placed probe could lead to a false temperature reading.