Basal Body Temperature
Updated:Basal body temperature (BBT) refers to the lowest body temperature attained during rest, typically measured immediately after waking and before any physical activity. In the context of sexual health and fertility, tracking BBT is a method used to identify ovulation and fertile periods in people with menstrual cycles.
The principle behind BBT tracking is that there's a slight increase in body temperature (about 0.5°F or 0.3°C) after ovulation due to increased progesterone levels. This temperature shift can help identify when ovulation has occurred and predict fertile windows.
Additional Information
BBT is typically measured using a special basal thermometer that's more sensitive than regular thermometers. For accurate results, it should be taken at the same time each morning, preferably after at least 3-4 hours of uninterrupted sleep.
While BBT tracking can be useful for fertility awareness, it's important to note that it only confirms ovulation after it has occurred. For those trying to conceive, combining BBT tracking with other fertility awareness methods, like cervical mucus observation, can provide a more comprehensive understanding of the fertile window.
Examples
A person trying to conceive might track their BBT daily, noting a sustained temperature rise as an indicator of recent ovulation.
Someone using natural family planning methods might use BBT tracking as part of their contraception strategy, avoiding unprotected sex during fertile periods.