For measuring core temperature in an elderly patient with fever, which site can be used?

For measuring core temperature in an elderly patient with fever, which site can be used?

• A. Oral
• B. Rectal
• C. Axillary
• D. Skin

Answer: (B)

Measuring core temperature is most accurate when the reading comes from a site that closely reflects the body's internal temperature. The rectum provides the best estimate of core temperature because it reflects the internal environment more reliably and is less affected by ambient temperature and peripheral factors than other sites. In an elderly patient with fever, this accuracy is particularly important for guiding assessment and treatment. Oral temperatures can be unreliable in fever due to mouth conditions, recent food or drink, or sweating; axillary and skin temperatures are more influenced by room temperature and peripheral blood flow, making them less dependable for core fever assessment. If there are contraindications to rectal measurement, other sites may be used, but rectal is the preferred option when accurate core temperature is needed.

Measuring core temperature is most accurate when the reading comes from a site that closely reflects the body's internal temperature. The rectum provides the best estimate of core temperature because it reflects the internal environment more reliably and is less affected by ambient temperature and peripheral factors than other sites. In an elderly patient with fever, this accuracy is particularly important for guiding assessment and treatment. Oral temperatures can be unreliable in fever due to mouth conditions, recent food or drink, or sweating; axillary and skin temperatures are more influenced by room temperature and peripheral blood flow, making them less dependable for core fever assessment. If there are contraindications to rectal measurement, other sites may be used, but rectal is the preferred option when accurate core temperature is needed.