Final answer:
The temperature of 39.5°C (103.1°F) in a 6-year-old child is outside of the expected reference range and indicates a fever, which should be reported to a medical provider.
Step-by-step explanation:
The medical assistant should recognize that a temperature of 39.5°C (103.1°F) is outside of the expected reference range for a 6-year-old child and should be reported to the provider. A heart rate of 100 beats per minute is normal for this age group, as the normal range is from 60 to 100 beats per minute. A respiratory rate of 18 breaths per minute is also within the normal range for a child of this age, which is closer to 18 to 30 breaths per minute. A blood pressure of 90/60 mmHg can be typical for a child, as the normal blood pressure range for children varies but is generally lower than adults. Therefore, the vital sign that is suggestive of a potential problem and should be reported is the elevated temperature, which indicates a fever and could be a sign of disease.