How is the Wet Bulb Globe Temperature (WBGT) index used to predict risk for heat stroke?

Updated: Aug 02, 2019
  • Author: Robert S Helman, MD; Chief Editor: Joe Alcock, MD, MS  more...
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The Wet Bulb Globe Temperature (WBGT) is an index used to gauge ambient conditions that can place an individual at risk for heat illness. This environmental heat stress index, used by the American College of Sports Medicine, is calculated using three parameters: temperature, humidity, and radiant heat. There is low risk if the WBGT is less than 65ºF, moderate risk if it is 65-73ºF, high risk if 73-82ºF, and very high risk if above 82ºF.

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