What is the normal basal body temperature range in Fahrenheit?

• A. 95.0 to 96.0
• B. 97.6 to 98.2
• C. 98.6 to 99.6
• D. 100.0 to 101.0

Answer: (B)

Basal body temperature is the body's resting temperature measured first thing in the morning before any activity. Before ovulation, it falls in a narrow range around the upper 97s to about 98.2°F, and the value 97.6 to 98.2°F is the commonly cited normal range for this resting measurement. After ovulation, progesterone causes a slight rise of about 0.5–1.0°F, so temperatures typically move into the high 98s to low 99s. Values far outside this range often reflect measurement conditions or illness rather than normal BBT. So the 97.6–98.2°F range best fits the expected baseline BBT.