the average (normal) temperature under the arm (98. 7 axillary) is about one degree less than the mouth (98. 6) and about two degrees less than the rectal temperature 99. 6). keep in mind that these are just average temperatures based on a poorly-controlled study using inaccurate thermometers done over a hundred years ago. we still adhere to it even though we now know the average is slightly different. temperatures also vary by the time of day (lower in the morning; higher in the evening). if you are transmitting information to a medical provider you do not have to add or substract a degree. all you need to do is say "the temperature was 99. 8 under the arm. " let the medical provider make the adjustments.
do you add a degree whentaking tempture under arm?