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Definition of Basal temperature

Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026

Basal temperature: 1) Usually, a person's temperature on awakening in the morning. As changes in basal temperature accompany ovulation, it is often tracked by women who wish to ensure or avoid pregnancy. 2) A crude measure of thyroid function via taking and comparing basal temperatures (also called the Broda test.)