Hyperpyrexia is defined as a temperature of 106 F or higher.

Hyperpyrexia is defined as a temperature of 106 F or higher.

• A. 90 F
• B. 99 F
• C. 100 F
• D. 106 F or higher

Answer: (D)

Hyperpyrexia is an extreme fever. It means the body temperature has risen to about 41°C (106°F) or higher, a level where the body's heat-regulating systems can be overwhelmed. This threshold marks a medical emergency because the risk of brain injury, dehydration, electrolyte imbalance, and organ dysfunction increases significantly. Fever, in general, is a rise above normal body temperature, but hyperpyrexia is far above that, at 106°F or higher. Temperatures like 90°F are below normal, and 99°F or 100°F are not in the hyperpyrexia range; they reflect normal low-grade fever or just a mild elevation, not the extreme level defined here.

Hyperpyrexia is an extreme fever. It means the body temperature has risen to about 41°C (106°F) or higher, a level where the body's heat-regulating systems can be overwhelmed. This threshold marks a medical emergency because the risk of brain injury, dehydration, electrolyte imbalance, and organ dysfunction increases significantly. Fever, in general, is a rise above normal body temperature, but hyperpyrexia is far above that, at 106°F or higher. Temperatures like 90°F are below normal, and 99°F or 100°F are not in the hyperpyrexia range; they reflect normal low-grade fever or just a mild elevation, not the extreme level defined here.