Comparison with other thermometers


Studies using children investigated the accuracy of different types of thermometers.

A study comparing reliable sources of rectum, ear and forehead thermometers in hospitals found that ear thermometers were more likely to detect fever than forehead thermometers. Rectal temperature readings confirm fever cases, and we recommend that rectal temperature readings be used to accurately measure body temperature.

Another study found that ear and forehead thermometers differed 2.1 to 2.2°C(3.78 to 3.96°F) in both experiments.

The 2020 study concluded that using forehead thermometers to quickly screen large numbers of people for fever is acceptable. However, they also write that a forehead thermometer may not be the most suitable method for determining accurate body temperature compared with an ear thermometer.