<span id="hs_cos_wrapper_name" class="hs_cos_wrapper hs_cos_wrapper_meta_field hs_cos_wrapper_type_text" style="" data-hs-cos-general-type="meta_field" data-hs-cos-type="text" >The Three Myths of Human Temperature Measurement</span>
06/16/2020

The Three Myths of Human Temperature Measurement

July 24, 2020 | Mark Lewis

We need a better approach

Myth 1: 98.6º F is “normal” body temperature.

98.6º – that number is instantly recognized as “normal” human temperature. In fact, normal is a moving target. And, a more accurate average for temperature across all individuals is closer to 97.7º. More importantly, everyone’s normal temperature is different. Women trend slightly warmer and everyone’s temperature varies by time of day. Individual differences can be up to 3º.


Myth 2: A temperature of 100.4º or greater means you have a fever.

While this statement is technically true, it’s not the whole story. Although 100.4º is a number at which pretty much everyone has a fever, those who have lower baseline temperatures could have a significant fever at much lower temperatures. For example, if someone’s baseline temperature is only 96.5º, a temperature of just 98.5º (below our mythical normal) could indicate a fever.


Myth 3: Thermometers and thermal cameras accurately measure human body temperature.

There are five typical places where body temperature is measured. They are under the tongue (mouth), ear, under the arm (axillary), on the forehead or rectally. Each of these has different degrees of accuracy and characteristics relative to core body temperature. Each also has conditions where significant measurement error can happen. For example, if you drink a cold liquid and measure your temperature in the mouth, the results can be quite inaccurate. Similar errors can happen with forehead, ear and under arm measurements.

So, with all these differences can we accurately detect a fever? The simple answer is no. At least not the way we measure temperature now.

FeverGuard — A Better Approach

FeverGuard is a revolutionary temperature monitoring system that eliminates the errors of point-in-time measurement. When an individual wears FeverGuard for just a couple days, it “learns” that person’s temperature profile. It learns the individual’s baseline as well as any cyclical (circadian) differences that occur during the day.

FeverGuard fits comfortably in the arm pit. While there can be some difference between the measured temperature at this location and your precise core body temperature, FeverGuard automatically compensates for the difference because the system establishes an individual temperature profile for that location and looks for temperature differences (anomalies) compared to the profile.

Because FeverGuard is a wearable, short-term anomalies (like going into a very cold environment or working out) are ignored by the system. Those short-term variations are noise. Continuous monitoring allows for measurement over time, providing the maximum ability to detect the onset of a fever.

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