The diagnosis of heat stroke is based on clinical symptoms and does not require any laboratory abnormalities. Laboratory test results for patients with heat stress or heat exhaustion are usually normal or consistent with dehydration; other organ systems are usually not involved. Nonetheless, heat stroke has been found to be associated with multisystem organ dysfunction as well as myocardial injury,60 so although diagnostic studies are not needed to verify the diagnosis and should not delay immediate treatment, diagnostic studies may assist with managing complications associated with a heat-related illness. (See Table 1.)
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