Hypothermia is defined by core body temperature below which threshold?

• A. Below 98.6°F
• B. Below 95°F
• C. Below 90°F
• D. Below 100°F

Answer: (B)

Hypothermia is defined by core body temperature falling below 95°F (35°C). Normal core temperature is about 98.6°F (37°C), with a typical range around 97–99°F. That 95°F cutoff marks the point at which heat loss exceeds production enough to impair essential bodily functions, leading to symptoms like shivering, slowed thinking, and reduced metabolism. For an accurate diagnosis, rely on core measurements (rectal, esophageal, or bladder) rather than oral readings, which can be influenced by environment or recent intake. The other temperatures listed aren’t hypothermia thresholds: 98.6°F is normal, 100°F is not hypothermia, and a reading near 90°F indicates moderate to severe hypothermia requiring urgent care.