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 ThermoScreen Infrared Fever
Screening System
Fever Threshold
Fever Threshold
is the internal body temperature above which a subject is classified as
having a fever. A temperature of 38°C (100.4°F) is often used by medical
practitioners as the threshold for a fever. However, studies indicate that
the threshold for a fever varies depending on a number of factors such as
age, gender, time of day, activity level, and clothing. For this reason,
the threshold for a fever should be determined based on the characteristic
of each specific subject group.
Adjusting the Fever Threshold
Operators may need to adjust the Fever Threshold in order to
minimize the number of missed detections or false alarms for their
specific fever screening applications. The figure below shows the
skin temperature distribution for both healthy and feverish
individuals and illustrates how the changing the Fever Threshold can
affect the number of missed detections and false alarms.
Lowering the Fever Threshold
(moving the vertical line to the left) will reduce the number of missed
detections, but will increase false alarms. Increasing the Fever Threshold
(moving the vertical line to the right) will reduce false alarms, but will
increase missed detections. In other words, if your priority is to minimize
the number of feverish subjects that are not detected, the Fever Threshold
should be lowered. This will however, result in a higher false alarm rate.
On the other hand, if your priority is to minimize the number of false
alarms, the Fever Threshold should be increased. This will however,
increase the number of missed detections.
The value of the Fever
Threshold depends on the specific requirements of your particular fever
screening operation. For example, many hospitals are able to conduct more
thorough fever screening evaluations because they have sufficient personnel
available to handle large numbers of false alarms. Hospitals, therefore,
would typically set the Fever Threshold lower in order to minimize missed
detections. In contrast, fever screening operations at many businesses and
manufacturing facilities are conducted by a limited number of health or
security personnel and may set the Fever Threshold higher in order to
minimize the number of false alarms.
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