Basal thermometer

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A basal thermometer is an ultra-sensitive thermometer used to take the basal (base) body temperature, the lowest normal body temperature. This temperature typically occurs during sleep, so the basal temperature is normally measured immediately upon waking.

Whereas ordinary household thermometers express body temperature to only one decimal place (e.g. 98.6 degrees Fahrenheit), basal thermometers express body temperature to two decimals places (e.g. 98.56 degrees Fahrenheit).

Basal thermometers are useful for charting a woman's fertility cycle, since basal body temperature typically rises when ovulation occurs. This information can be used to help maximize or minimize the chance of pregnancy.

Basal thermometers are used as part of the Sympto-Thermal method of Natural family planning.

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