Comparison of body temperature recordings using mercury and liquid crystal forehead thermometers

ABSTRACT

The study was carried out to compare the recordings of body temperature using oral mercury thermometer and liquid-crystal forehead thermometer, so as to assess and ascertain the accuracy and validity of the later method. Setting: Hira General Hospital, Abbottabad. Subjects and Materials Simultaneous recordings were made using the two devices in randomly enrolled 147 patients. The ages of patients ranged from 10 years to 90 years. FeverScan liquid-crystal forehead thermometer, Boots [UK] was used for forehead temperature while Chinese made mercury thermometer [Safety] was used to check oral temperature. Significant difference existed between the recordings of two devices. The mean difference was 1.19 degree F [p<0.001]. FeverScan liquid-crystal forehead thermometer recorded higher temperatures. In patients without pyrexia both devices recorded temperature within normal range. Conclusions: The sensitivity of FeverScan liquid-crystal forehead thermometer to detect fever was comparable to mercury thermometer but was unreliable in grading fever and showed a tendency to over estimate the temperature. It is a good device for home use but health providers should not use it. Mercury thermometer remains the gold standard