A nurse will assess a client's temperature using a tympanic thermometer. Which action should the nurse include in the plan?

A. Placing a thermometer in the axilla (armpit) is used for axillary temperature measurement, not tympanic measurement. Axillary readings tend to be lower than core body temperature and are less accurate than tympanic or oral methods. B. Oral temperature measurement requires a digital or glass oral thermometer, not a tympanic thermometer. Tympanic thermometers are designed specifically for the ear canal and use infrared technology to measure the temperature of the tympanic membrane. C. Placing a thermometer on the forehead is used for temporal artery temperature measurement with a temporal artery thermometer. It is not the correct placement for a tympanic thermometer. D. A tympanic thermometer measures body temperature by detecting infrared heat emitted from the tympanic membrane in the ear canal. Proper placement in the external auditory canal is essential for an accurate reading. For adults, the pinna should be gently pulled up and back to straighten the ear canal before inserting the thermometer. This method provides a rapid, accurate estimate of core body temperature.