Which temperature range defines severe hypothermia?

• A. Mild 90°-95°F (33°-35°C)
• B. Moderate 82°-90°F (28°-32°C)
• C. Severe <82°F (<28°C)
• D. Hyperthermia >104°F

Answer: (C)

Severe hypothermia is defined by a core temperature well below normal, specifically below 28°C (less than 82°F). At this level, metabolism slows dramatically, mental status is severely impaired, and the risk of life-threatening arrhythmias increases. Mild hypothermia ranges about 32–35°C (90–95°F), where shivering and some autonomic responses are still present. Moderate hypothermia is roughly 28–32°C (82–90°F), where shivering may stop and cognition deteriorates. Hyperthermia, the opposite, involves temperatures above normal, typically over 38°C (100.4°F) and higher.