A nurse is observing an assistive personnel (AP) take a client's tympanic temperature. Which of the following actions should the nurse identify as an indication that the AP understands how to perform the procedure?

Tympanic temperature measurement assesses core body temperature using an infrared sensor placed in the external auditory canal. Proper technique is essential to ensure accurate readings because the ear canal must be straightened to allow correct alignment with the tympanic membrane. Technique varies slightly depending on age, but correct positioning of the pinna is a key step. Nurses must ensure assistive personnel understand anatomy and proper device use to obtain reliable vital sign data. Rationale: A. Inserting the probe with a straight, forward motion is incorrect because the ear canal is not straight and requires proper alignment by adjusting the pinna. Simply inserting the probe without repositioning the ear canal may result in inaccurate readings due to obstruction or improper angle toward the tympanic membrane. B. Pointing the probe posteriorly is incorrect because the probe should be directed toward the tympanic membrane after proper straightening of the ear canal. Incorrect angling can prevent accurate infrared detection of core temperature and result in falsely low or inconsistent readings. C. Pulling the pinna up and back is correct because this maneuver straightens the ear canal in older children and adults, allowing the probe to align directly with the tympanic membrane. This positioning ensures accurate temperature measurement by reducing curvature interference in the ear canal. D. Positioning the client facing the nurse is not a required step for accurate tympanic temperature measurement. It may assist with accessibility, but it does not contribute to correct anatomical alignment of the ear canal. Proper technique depends on pinna positioning rather than client orientation.