The nurse is caring for a group of clients. For which client should the nurse use a rectal temperature probe?

Choice A reason: A 78-year-old client receiving oxygen via nasal cannula would not require a rectal probe. Oral or tympanic methods are safer and more appropriate. Rectal probes are avoided in older adults due to increased risk of mucosal injury, hemorrhoids, or discomfort. Choice B reason: A 10-year-old with an ear infection should not have a rectal probe used. Tympanic thermometers may be inaccurate due to infection, but oral or temporal methods are safer and less invasive. Rectal temperature is not indicated in this age group unless absolutely necessary. Choice C reason: A 3-year-old during a routine physical exam does not require rectal temperature measurement. Rectal probes are invasive and reserved for situations where accuracy is critical, such as when the child is critically ill. For routine exams, axillary or temporal methods are preferred. Choice D reason: A 26-year-old who is unresponsive requires the most accurate core temperature measurement. Rectal temperature is considered the gold standard for core body temperature in critically ill or unresponsive clients. It provides reliable data when oral or tympanic methods are not feasible.