Is there a documented disorder/disease where a person's temperature is clinically greater than the thermometer reading? I'm drawing a blank as to what it could be. I have a mother who wants a courtesy call or pick up call for her child if the temp is in the 98s/99s because if its 98 then its 99 and if its 99 its 100. She stated that all her family is this way but there is no actual diagnosis on file. Shed some light for me guys.