Basal Body Temperature
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Basal body temperature (BBT) is your body’s lowest natural temperature when fully at rest, typically measured immediately after waking up and before any activity, eating, or drinking. It reflects your body’s resting metabolic rate and is influenced by hormonal changes throughout the menstrual cycle.
- Before ovulation, estrogen dominance keeps BBT relatively low, usually between 96°F and 98°F (35.5°C to 36.6°C).
- After ovulation, progesterone rises, causing a 0.5°F to 1°F (0.3°C to 0.6°C) increase in BBT, which remains elevated until menstruation begins.
- This biphasic pattern—a distinct temperature shift—helps identify ovulation and track fertility.
BBT is best measured daily with a basal thermometer (accurate to 0.1°F or 0.05°C) at the same time each morning to ensure consistency and accuracy. While useful for fertility awareness, BBT only confirms ovulation after it has occurred and is not a reliable method for detecting early pregnancy.
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Sunday, February 15, 2026 03:27PM