The temporal, or temple, thermometer is a non-invasive device that quickly measures body temperature using infrared technology. It senses the heat emitted from the temporal artery, a blood vessel just beneath the skin on the forehead and temple. The temporal artery is an ideal site because its blood flow accurately reflects the body’s core temperature. Achieving a reliable reading depends entirely on correct physical placement and technique during the scan.
The Essential Technique for Temple Placement
The correct procedure begins by placing the thermometer’s probe against the center of the forehead. Before activating the device, ensure the scanner makes gentle contact with the skin or is held at the specific distance recommended for non-contact models. This initial positioning targets the start of the temporal artery.
Once positioned, activate the scan, often by depressing and holding a button. The process involves a smooth, straight motion, gliding the device across the forehead toward the hairline near the top of the ear. Maintaining consistent speed and contact (or distance) throughout this sweeping movement is necessary because the device captures hundreds of measurements per second along the artery’s path.
Continue the scan until the thermometer reaches the hairline, stopping near the temple or, depending on the model, sometimes just past the earlobe in the soft depression behind the ear. It is important to move in a straight line without curving the swipe downward toward the cheek or missing the artery’s path, as this can lead to an artificially low or inaccurate result. Once the sweeping motion is complete, release the button, and the resulting temperature is displayed.
Pre-Measurement Checks to Ensure Accuracy
External and physiological factors can significantly interfere with the infrared heat measurement, leading to skewed results. Ensure the forehead is dry and free of sweat, as moisture causes evaporative cooling and leads to an inaccurate, lower temperature. Similarly, move excessive hair, hats, or headbands aside to allow the sensor direct access to the skin.
The surrounding environment plays a role in measurement accuracy. Do not take readings near drafts, direct sunlight, or in extremely cold rooms, as these conditions alter the skin’s surface temperature. If the person has recently come inside from extreme heat or cold, a waiting period of 10 to 20 minutes is recommended to allow the body to acclimate.
Confirm that the thermometer’s sensor lens is clean before use. Dust, smudges, or damage can block the infrared signal and affect the reading. Cleaning the lens with an alcohol-moistened cotton swab and allowing five minutes for recalibration promotes consistent accuracy.
Understanding and Interpreting Temporal Readings
A successfully acquired temporal artery reading measures the body’s temperature to detect fever. The normal range for a temporal temperature is 95.4°F to 98.6°F (35.2°C to 37.0°C). This range is often slightly lower than the traditionally cited oral temperature of 98.6°F (37°C).
Temporal artery temperatures are 0.5°F (0.3°C) to 1°F (0.6°C) lower than a classic oral measurement. This difference is due to the method of measurement and the body’s natural temperature variations across sites. A temperature of 100.4°F (38°C) or higher, as measured by a temporal thermometer, is recognized as a fever.
When the device registers a fever, monitor symptoms and remain hydrated. While a temporal thermometer is effective for screening and monitoring temperature changes, a persistent or rising fever, especially in infants, warrants seeking medical advice. Using the same method and device consistently for comparison over time is more important than small variations between different thermometer types.