Certified Medical Assistant (CMA AAMA)Clinical Workflow and Patient IntakeHard
A 6-week-old infant is brought to the office with a fever. Which method of temperature measurement is considered most accurate for this patient?
- ARectal
- BTympanic
- COral
- DAxillary
Show answer & explanationAnswer & explanation
Correct answer: A. Rectal
Rectal temperature measurement is considered the most accurate method for infants under 3 months of age because their small ear canals make tympanic readings unreliable, and oral measurement is not feasible. Rectal readings most closely reflect core body temperature.
Why the other options are wrong
- B. Incorrect; tympanic readings are unreliable in very young infants due to small ear canal size.
- C. Incorrect; oral temperature is not appropriate or safe for infants.
- D. Incorrect; axillary readings are the least accurate method and often underestimate temperature.
Infant Temperature Measurement
For infants under 3 months, rectal temperature is the most accurate method because it closely reflects core body temperature and avoids inaccuracies from small ear canals or improper oral technique.
- Rectal is gold standard for infants <3 months
- Tympanic unreliable in small ear canals
- Axillary is least accurate, used only as an estimate
Memory trick: Tiny ears, trust the rectal