Types of Thermometer and Their Accuracy
There are various types of thermometers used in the medical field. Let us examine some of them today.
Digital touch thermometers
determine body temperature using heat sensors. We can use them orally, under
the armpits, or up the rectum. Note that taking oral temperatures as the base,
such a digital thermometer gives a reading half a
degree lower in the armpits and half a degree higher in the rectum when
measured in Celsius. They give accurate readings in less than a minute.
Oral thermometers are those that work only when placed in the mouth under the tongue. They can be both digital and analog (mercury). The average body temperature varies from 36.1 to 37.2 degrees Celsius. Oral readings are generally very accurate, and we can use them for anyone above the age of three.
Digital Tympanic
Thermometer
Tympanic or ear thermometers measure the temperature through the ear canal. They use infrared ray technology. Temperatures are generally 0.3-0.6 degrees Celsius higher than when taken through the mouth. The readings come fast.
Temporal Thermometer
They are infrared
thermometers that can measure the temperature on the forehead. They focus on
the superficial temporal artery, a branch of the carotid artery, and use
infrared sensors to detect the temperature. They are generally used from a
distance, and that is, they have become popular during the pandemic and at
venues such as malls and airports, where the crowd is large. They are extremely
fast, but they report a temperature about half a degree Celsius lower than an
oral thermometer, on average.
Nowadays, with the advent
of modern technology, a thermometer comes in the form of an app. However, one
must be cautious because most such apps are designed to record atmospheric
temperatures and not body temperatures. Phone applications for body
temperatures are based on digital thermometers, which can be connected to the
phone via Bluetooth. The accuracy of these kinds of thermometers depends on the
underlying digital thermometer.
As the name suggests, this
is a thermometer on a pacifier. Since there is constant contact with the mouth,
it can provide easy readings. However, they give average readings and not
accurate for instant temperatures.
Once the thermometer of
choice, they have fallen into disuse due to the toxicity of mercury. However,
they give accurate readings, even though it takes time. Additionally, there are
no hassles of changing batteries or recharging power.
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