Fever is defined when body temperature exceeds more than?

Appeared in: SGPGI Nursing Officer-2022

Explanation

Fever, or pyrexia, is clinically defined as a body temperature that is elevated above the normal range.
The standard threshold for defining a fever in an adult is a temperature of 38°C (100.4°F) or higher.
This elevation is a regulated response by the hypothalamus to pyrogens, which are fever-inducing substances.
While mild fevers can be a beneficial part of the immune response, high fevers require monitoring and management.

Option B: A temperature of 37.6°C is generally considered a low-grade or borderline fever, not the standard clinical definition of a significant fever.
Option C: A body temperature of 35.2°C is indicative of hypothermia (low body temperature), which is the opposite of fever.
Option D: A temperature of 36.3°C falls within the normal range of body temperature for a healthy adult (typically 36.5°C to 37.5°C).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Definition of Fever (Pyrexia) as background academic context rather than a clinical decision trigger.
Accurate temperature assessment is a fundamental nursing skill. It is crucial to use the correct technique and note the measurement site (oral, axillary, rectal, tympanic) as it affects the interpretation of the reading.
Nursing interventions for fever include monitoring vital signs, administering antipyretics as prescribed, encouraging fluid intake to prevent dehydration, and providing comfort measures like removing excess blankets.
What if? If the patient is a neonate (0-28 days old), a rectal temperature of 38°C (100.4°F) is considered a medical emergency requiring a full sepsis workup, as newborns have immature immune systems and can deteriorate rapidly.

How to Approach the Question

First, identify the core question, which is asking for the specific temperature that defines a fever.
This is a factual recall question. Access your knowledge of normal and abnormal vital signs.
Recall the standard normal body temperature range (approximately 36.5–37.5°C or 97.7–99.5°F).
Evaluate each option against this baseline. Temperatures within or slightly above this range are not considered a definitive fever.
Identify the option that matches the established clinical threshold for pyrexia, which is 38°C (100.4°F).
Eliminate the other options: one is a low-grade fever, one is normal, and one represents hypothermia.

Concept Tested & Keywords

QPJ86vLqZzVfTtjQFg89L0

E6 Nursing Fundamentals Potter Perry 12e Part 3 p. 11-13

E6 Nursing Fundamentals Taylor p. 118-120

E6 Nelson Textbook of Pediatrics(2024) — Volume 1 p. 1642-1644

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