How much higher is rectal temperature than axillary temperature?
Nov 15, 2025
Source: Cainiu Health
Dr. Wang Lei
Introduction
Under normal circumstances, rectal temperature is 0.3°C to 0.6°C higher than axillary temperature, but specific conditions should be taken into account for accurate interpretation. If abnormal body temperature or discomfort occurs, prompt medical attention is recommended. For daily care, use a certified rectal thermometer, disinfect it with alcohol before measurement and wipe it dry. During measurement, assist the individual in maintaining a comfortable position and avoid sudden movements. After measurement, clean the thermometer promptly and store it properly.
Under normal circumstances, rectal temperature is 0.3°C–0.6°C higher than axillary temperature, but this should be interpreted according to specific conditions. If abnormal body temperature or discomfort occurs, medical advice should be sought promptly. Detailed analysis is as follows:
When the body is at rest in a calm state, without recent strenuous exercise, with stable emotions, in a suitable ambient temperature, and without consuming excessively hot or cold food, and when the rectal thermometer is properly placed and left in place for sufficient time, rectal temperature is typically about 0.3°C higher than axillary temperature.
Immediately after intense physical activity, emotional excitement, exposure to high environmental temperatures, or consumption of hot food or beverages, or if the rectal thermometer is inserted too shallowly or not left in place long enough, measurement errors may occur. In such cases, rectal temperature may appear up to 0.6°C higher than axillary temperature.
In daily care, use a reliable rectal thermometer and disinfect it with alcohol before measurement, then dry it thoroughly. During measurement, assist the individual in maintaining a comfortable position and avoid sudden movements. After measurement, clean the thermometer promptly and store it properly. Adjust clothing according to ambient temperature to prevent overheating or overcooling. Wait at least 30 minutes after physical activity or eating before taking a measurement to ensure accuracy. Monitor the individual closely during the process to prevent injury from potential thermometer breakage.
