Can infrared temperature measurement detect low-grade fever?

In general, infrared temperature measurement can detect low-grade fever, but it has a certain margin of error. A mercury thermometer can be used to obtain a more accurate body temperature reading.

Infrared thermometers measure temperature by detecting the infrared radiation emitted from an object's surface. They are fully capable of detecting low-grade fevers, using specialized infrared sensors to absorb radiation and determine the precise temperature of the human body or other objects. When body temperature exceeds 37.2°C, the infrared thermometer can capture the corresponding signal. A temperature between 37.3°C and 38.5°C is considered a low-grade fever.

Infrared temperature measurement may have some degree of inaccuracy, as it can be influenced by environmental factors, or by wearing clothing that is too thick or too thin, all of which may lead to inaccurate readings. For a more reliable assessment of body temperature, measurements should be taken under the armpit or rectally, or a mercury thermometer can be used to determine the exact temperature.