Question

the thermometer kept under tongue,underarm and rectum.why?

Answer 1

The thermometer kept under tongue, underarm because these places are the accepted locations to determine body temperature. Medical procedures need to be uniform . Taking temperature in different places yields different results, so too many different methods would be confusing. The rule of thumb is that under the arm will be 1 degree less then oral, and rectal will be higher then 1 degree oral.