A rise in temperature is noted, is it a true thermal shift?
Not every rise in temperature indicates a thermal shift. A temperature disturbance is a false temperature rise due to causes other than ovulation. Factors that can disturb the temperature should always be noted in the chart and a disturbed temperature is marked with a circle and discounted when interpreting the temperature chart.
Causes of a disturbance of the Temperature (Basal Body Temperature, BBT):
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Taking the temperature at a different time that usual.
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Taking the temperature in a different orifice that usual.
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Using a different thermometer.
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Alcohol intake the night before.
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A Disturbed night.
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Sleeplessness
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Fever due to illness.
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Travel/ Holidays
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Stress
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Emotional upsets
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Medication
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Heavy meal before sleeping
