Measure temperature properly: Electronic thermometer won't lie again
How to properly measure temperature (photo: freepik)
Does your electronic thermometer seem inaccurate or like it’s "lying"? Learn how to properly measure temperature with an electronic thermometer to get reliable readings every time. So, how to measure temperature correctly using an electronic thermometer?
What you need to know about electronic thermometers
Electronic thermometers can be very accurate if you understand their features and follow certain rules. The main difference from mercury thermometers lies in the measurement principle and the time needed to get a final result. The electronic sensor reacts quickly to changes in temperature, but it takes a bit more time to stabilize and reflect the actual body temperature, more than just waiting for the beep.
How to get an accurate result
Read the instructions
Every thermometer has its specifics. The manufacturer indicates the optimal measurement time and recommended usage method for that particular model. This is the most important step.
Choose the right measurement site
Oral cavity (mouth)
This is one of the most accurate methods for electronic thermometers. Place the tip of the thermometer deep under the tongue, closer to the base. Close your mouth tightly and breathe through your nose during the entire measurement. Do not remove the thermometer immediately after the beep! Wait another 30–60 seconds (or as instructed) for the reading to stabilize.
Armpit (axillary)
This is the most common method, but also the least accurate, especially if you rush. The main mistake is stopping the measurement after the first beep. To get a more reliable result, place the tip of the thermometer as deeply as possible in the center of the armpit, ensure full contact with the skin (press your arm firmly to your body), and wait an additional 5–7 minutes after the beep.
Yes, that’s how long it takes for the armpit temperature to equalize with the body's and for the sensor to register it. Keep in mind that armpit readings can be 0.5–1°C lower than oral or rectal ones. This method is best for monitoring temperature trends over time.
Rectal measurement
This is the most accurate method, especially for infants. It requires caution, use of lubricant, and good hygiene. It usually takes about 1–2 minutes.
Follow general guidelines
Do not take your temperature right after physical activity, eating or drinking something hot or cold (if measuring orally), or after a bath or shower. Wait 20–30 minutes.
Make sure the measurement area (armpit, mouth) is dry.
Check that the thermometer sensor is clean before use.
For tracking your condition, try to measure temperature at the same time of day and in the same location on the body.
Contactless (infrared) thermometers
If you’re using one of these, remember that their readings can be affected by the surrounding temperature, skin moisture (sweat), or hair. Measure in a clean, dry area without drafts. They are convenient for quick screening but may have a greater margin of error compared to contact thermometers.
Sources: websites of the Ministry of Health, Centers for Disease Control and Prevention (CDC), and the World Health Organization (WHO)
This material is for informational purposes only and should not be used for medical diagnosis or self-treatment. Our goal is to provide readers with accurate information about symptoms, causes, and methods of detecting diseases. RBС-Ukraine is not responsible for any diagnoses that readers may make based on materials from the resource. We do not recommend self-treatment and advise consulting a doctor in case of any health concerns.
