Putting a thermometer under the tongue for five minutes immediately after waking up, recording body temperature number in a specially designed form, continuously measuring for one to three months while recording information on menstruation and cervical mucus, whether ill or not.

Since female basal body temperature only rises 0.3-0.6°C /0.54-1.08°F after ovulation, normal mercury thermometer is not accurate enough due to their margin of error of 0.5ºC/1.0°F, making it unsuitable for measuring basal body temperature. Many pregnancy preparation groups recommend using an electronic thermometer based on thermistor technology. Some thermometer manufacturers have added recording and charting functions to their basal body temperature thermometers.

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