The core body temperature of a patient can be measured from which of the following sites?

Appeared in: RML 2023

Explanation

Core body temperature refers to the temperature of the internal organs, such as those in the thoracic and abdominal cavities.
The mid-esophagus is located deep within the chest, providing a direct and accurate measurement of the temperature of the body's core.
This method is highly reliable and frequently used for continuous monitoring in critically ill patients, such as during surgery or in the ICU, as it reflects the temperature of blood flowing through major vessels.

Option A: The axilla (armpit) measures surface temperature, not core temperature. It is less accurate and can be influenced by environmental factors and local blood flow.
Option C: The ante-cubital fossa (the inner side of the elbow) is not a standard, validated, or clinically accepted site for measuring body temperature.
Option D: Measuring temperature under the tongue (oral) provides a sublingual temperature, which is a surface measurement. It is not a true core temperature and can be affected by recent eating, drinking, smoking, or mouth breathing.

Clinical Relevance

Nursing practice connection: Knowing Core vs. Surface Body Temperature Measurement Sites helps nurses interpret findings accurately and avoid errors in routine assessment, medication administration, and patient teaching.
Accurate core temperature monitoring is vital for managing patients with conditions like sepsis, hypothermia, or malignant hyperthermia, and for patients undergoing major surgery.
Nurses must select the most appropriate temperature measurement site based on the patient's clinical condition, the required accuracy, and facility policy.
What if? If a patient is actively being cooled for therapeutic hypothermia after cardiac arrest, an esophageal probe is superior to an oral reading. The esophageal probe provides real-time core data essential for precise temperature control, whereas an oral reading would lag and be inaccurate, potentially leading to over- or under-cooling.

How to Approach the Question

First, identify the key concept in the question stem, which is 'core body temperature'.
Differentiate between 'core' temperature (internal organs) and 'surface' temperature (skin, mouth, axilla).
Evaluate each option based on this differentiation.
Recognize that 'axilla' and 'under the tongue' are common sites for surface temperature.
Identify 'ante-cubital fossa' as a non-standard site for temperature measurement.
Conclude that the 'mid oesophagus', being an internal thoracic structure, is the only option that provides a true core temperature reading.

Concept Tested & Keywords

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E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 13-15

E6 Nursing Fundamentals Taylor p. 121-123

Practise the full RML 2023

Attempt every question from this paper in a timed mock, then review the full solution for each one.