Heat stroke is defined by core temperature at or above what value?

Heat stroke is defined by core temperature at or above what value?

• A. 40°C
• B. 39°C
• C. 41°C
• D. 38°C

Answer: (A)

Heat stroke is defined by a dangerously high core temperature plus impaired mental status. The commonly cited threshold is a core temperature at or above 40°C (104°F). This makes 40°C the best answer because it marks the point at which thermoregulation fails and brain function is affected, distinguishing heat stroke from milder heat illnesses like heat exhaustion. A temperature of 39°C or 38°C would indicate heat-related illness but not heat stroke. A higher temperature, such as 41°C, can occur with severe heat stroke, but the standard diagnostic cutoff used in EMS guidelines is 40°C.

Heat stroke is defined by a dangerously high core temperature plus impaired mental status. The commonly cited threshold is a core temperature at or above 40°C (104°F). This makes 40°C the best answer because it marks the point at which thermoregulation fails and brain function is affected, distinguishing heat stroke from milder heat illnesses like heat exhaustion. A temperature of 39°C or 38°C would indicate heat-related illness but not heat stroke. A higher temperature, such as 41°C, can occur with severe heat stroke, but the standard diagnostic cutoff used in EMS guidelines is 40°C.