Rectal thermometers measure body temperature from the rectum. They are distinguished from other thermometers by a stubby tip, designed to fit easily into the rectal opening. They are considered the most accurate thermometer for fever detection, particularly in babies. Most rectal thermometers have to be shaken before insertion to set the temperature below 37oC (98.6oF), the normal body temperature, because rectal temperatures are higher than other body parts by about half a degree.
Kinds of Rectal Thermometers include the following:
Glass rectal thermometers
Glass rectal thermometers consist of a calibrated glass tube containing mercury, alcohol, or other heat-sensitive element. When exposed to heat, the element expands and rises up the temperature scale on the tube, stopping at the corresponding line. They usually have marks pointing to the 37oC line for easier reference.
Digital rectal thermometers
Digital rectal thermometers use infrared beams or liquid crystals that change state or color according to body temperatures. They display temperatures in numeric form on a small LCD screen. They are usually powered by button batteries and may lose accuracy when the batteries run low.
Readability: Choose a rectal thermometer with clear markings to make them easier to read. Make sure the calibrations are easily readable against the glass tube. If you have poor vision, look for one with large numbers or choose a digital thermometer with a lighted display.
Safety: Make sure the glass tube is durable and impact-resistant to prevent the leaks. This is especially important for mercury thermometers because mercury is highly toxic. Make sure the tube is tightly sealed and firmly connected to the bulb. Choose a digital thermometer in a plastic casing to avoid poisoning.
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