What is the normal axillary and rectal temperature for term newborns?

Appeared in: DSSSB October 2024

Explanation

The normal axillary temperature for a term newborn is internationally recognized as 36.5°C to 37.5°C.
The option providing an axillary range of 36.5°C to 37.4°C falls squarely within this normal, safe range.
Physiologically, rectal temperature is slightly higher than axillary temperature. The provided rectal range of 36.7°C to 37.9°C correctly reflects this difference.
Maintaining this narrow temperature range (euthermia) is crucial for a newborn's metabolic stability and prevents complications like cold stress and hypoglycemia.

Option A: This range (36.0°C to 36.5°C) indicates mild hypothermia or cold stress, not a normal temperature.
Option B: The upper limit of this range (37.9°C) extends into hyperthermia (fever), which is defined as an axillary temperature greater than 37.5°C.
Option C: This entire range (37.5°C to 38.5°C) represents hyperthermia or fever, a sign of illness or environmental overheating.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Newborn Thermoregulation and Normal Vital Signs as background academic context rather than a clinical decision trigger.
Nurses must perform routine temperature checks on newborns, as instability is an early and critical sign of problems like infection (sepsis) or cold stress.
The axillary route is the preferred method for routine checks in newborns because it is safe and non-invasive, reducing the risk of rectal perforation associated with the rectal route.
Key nursing interventions for hypothermia (cold stress) include immediate skin-to-skin contact with the mother, drying the infant thoroughly, wrapping in warm blankets, and placing the infant under a radiant warmer.

How to Approach the Question

First, identify the core of the question: recalling the normal vital sign parameters for a specific population, which is term newborns.
Recall the standard axillary temperature range for a newborn, which is approximately 36.5°C to 37.5°C.
Evaluate each option's axillary range against this standard. Options with ranges that are too low (hypothermic) or too high (hyperthermic) can be immediately eliminated.
Remember the general physiological rule that rectal temperature is slightly higher than axillary temperature.
Check if the remaining plausible option reflects this physiological difference correctly.
Select the option where both the axillary and rectal ranges are physiologically correct and fall within the accepted normal limits for a term newborn.

Concept Tested & Keywords

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E6 Ghai Essential Pediatrics(pp 26-904 of 913) p. 138-140

E6 Nursing Fundamentals Taylor p. 122-124

Practise the full DSSSB October 2024

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