Sir.—I wish to add my experience with liquid crystal forehead temperature strips to the article "Liquid Crystal Forehead Temperature Strips: A Clinical Appraisal" by Scholefield et al (Journal 1982;136:198-201).
I compared readings from the Fever Scan temperature strip (the more accurate of the devices evaluated by Scholefield et al) with those from precalibrated glass thermometers in 77 infants and children with a history of fever. Temperatures were taken in the following order: Fever Scan, axillary, and then rectal. Glass thermometers were held in a deep axillary fold or rectum for at least two minutes. Fever Scan readings were counted as elevated if they were greater than or equal to 38.0 °C. Axillary measurements were so counted if they were greater than or equal to 37.2 °C, that is, 38.0 minus 0.8 °C, the average difference between rectal and axillary measurements.
Fever Scan detected 67% of patients with rectal temperatures