The accuracy of wrist temperature scanning.

Body temperature varies from person to person, and certain things can affect it, such as gender, age, and ambient environment. Women often have a higher body temperature than men, older patients a lower body temperature, and sometimes a baby's temperature is slightly higher. Other factors influence body temperatures like stress, metabolic disturbances, illness, medication, and surgical procedures. With this in mind, normal body temperature can vary from 96˚F to 99.7˚F, but anything reaching 100.4˚F or above is considered a fever. It will also differ depending on the method used to take the temperature, and these methods have changed and developed over the years.

Read more here.