The most convenient way of taking your, or another persons temperature is by mouth, by placing a mercury or digital thermometer under the tongue. Alternatively it can be placed in the armpit. Don't use the tongue method for a young child or a confused patient. They may bite the end off the thermometer by mistake. Take the temperature under the arm instead. The normal reading for under the arm will be about 0.6C lower than a reading taken orally.
Before taking a temperature make sure that the person is relaxed, 20 minutes after a meal, hot drink or bath. Don't take a temperature after exercise it can lead to an inaccurate reading.
If you are in any doubt Contact your doctor straight away